St. Louis Pizza, Explained: Provel, Cracker Crust and the Square Cut
Revised August 16, 2026
What is Saint Louis style pizza?
A round, thin, cracker-crisp pizza built on yeast-free dough, topped with Provel rather than mozzarella and a sweeter, oregano-heavy sauce, then cut into three- or four-inch squares. All four markers have to be present. Drop the Provel or put yeast in the dough and you have thin-crust pizza — a fine thing, but a different one.
Keep reading ↓Imagine it’s a Friday in October and four people are coming over at seven. One of them grew up in Affton. One moved here from Denver a year and a half ago and has been polite about a lot of things. You order pizza, because that is what you do on a Friday, and forty minutes later a flat box lands on the counter, cut into little squares, covered in a cheese that does not stretch.
The transplant picks up a corner piece, chews, and says the thing transplants always say. The Affton native has a rehearsed answer ready. Somewhere in Florissant tonight that same exchange is happening over that same box. In St. Charles somebody is quietly defending mozzarella. In Belleville somebody is insisting the good stuff was always on the Illinois side of the river.
Here is the trouble: everyone has a view on who has the best St. Louis style pizza, and almost nobody can define the style. So let’s define it. What St. Louis pizza is, where it came from, why the cheese behaves like that, and how it shifts as you drive across the metro.
What is different about St. Louis-style pizza?
St. Louis-style pizza is a round, thin, cracker-crisp pizza built on dough made without yeast, topped with Provel cheese instead of mozzarella and a sweeter tomato sauce heavy on oregano, then cut into three- or four-inch squares instead of wedges. All four of those things have to be present. Two out of four is just thin-crust pizza.
The yeast-free dough is the part people underrate. It gets rolled thin rather than stretched, and because there is nothing in it to rise, it never puffs in the oven. It dries and it snaps. That crust is load-bearing in the literal sense — rigid enough to hold a heavy square flat on your palm, which is exactly why the square cut works on this pizza and would be absurd on a New York slice.
The sauce runs sweeter than most American pizza sauce and carries noticeably more oregano. That is generally traced to the Sicilian influence on Italian cooking in St. Louis, a real lineage rather than a vague nod at the old country. Order the same pie in Kirkwood and in Maryland Heights and the sweetness is the thing that stays constant.
What is Provel, and why does it split a room?
Provel is a processed cheese blend of cheddar, Swiss and provolone with liquid smoke added. It has a low melting point, so it turns gooey and buttery rather than stringy — you will never get the cheese-pull that strips a mozzarella pizza bare on the first slice. Buying Provel cheese outside of St. Louis is hard, because it is rarely sold beyond this market. Locally it sits in the dairy case at Schnucks, Dierbergs and Hy-Vee.
The liquid smoke is the whole fight. It gives Provel a savory, faintly smoky edge that reads as comfort food if you grew up on it and as deeply strange if you didn’t. KCUR, Kansas City’s NPR station, described it in 2022 as the pizza style everyone loves to hate. Nobody around here is neutral on it.
The corporate history is oddly murky for something this local. The Provel name was first trademarked in 1947 by the Churny Company of Glenview, Illinois. Lactalis acquired Hoffman Dairy from Kraft in 2021 and now holds the trademark, though its own foodservice catalog lists the product plainly as “St. Louis Style Pizza Cheese” rather than by name. Imo’s still packages and sells shredded Provel to consumers.
And if Provel is not for you, that is a preference, not a verdict on the style. Ask whether the kitchen will build the same thin crust with mozzarella. Plenty in this metro will.
Where did the square party cut come from?
The square cut is not originally ours, which surprises people. It is called a party cut or a tavern cut, and both Milwaukee and Chicago claim to have started it. Milwaukee points to the Caradaro Club, opened in 1945. Chicago points to a cluster of rooms between 1946 and 1950, including Vito and Nick’s and Home Run Inn. The explanation is always the same: squares let a bar customer hold pizza in one hand and a beer in the other, and a tavern with no plates could serve it on a napkin.
St. Louis has its own origin story for the cut, and it is a good one. Ed Imo was a tile setter who sliced linoleum squares by day and pizza by night, and the square slice is popularly credited to him. The trouble is the timeline. Amedeo Fiore was already cutting his pizzas into squares with a pair of scissors in 1945, nearly twenty years before the first Imo’s opened. The tile story is charming. It is not the origin.
Who actually invented St. Louis-style pizza?
There is no single founder, and the honest answer points at a basement on North Sarah Street. Feast Magazine’s history of the style traces it to Melrose Pizzeria, which Amedeo Fiore opened in 1945 in the basement of 204 N. Sarah St. His April 1947 advertisement in the St. Louis Post-Dispatch had to teach readers how to say the word: “Say (peet-sa).”
Two more pizzerias followed him into that same basement. Parente’s opened in 1948, run by brothers Louis and Joseph Parente who had worked for Fiore. Rossino’s opened in 1954 and lasted until 2006. St. Louis historian Harley Hammerman told Feast that the basement at 204 N. Sarah is where St. Louis pizza was born.
Provel arrived separately and later. The Chicago-based J.S. Hoffman Co. applied for the trademark in 1947, was refused, and got it in 1950. Feast identifies Luigi’s, opened in 1953 by Luca Meglio at Watson Road and Arsenal, as the first pizzeria to really commit to the cheese. So the crust came first by roughly eight years, and the cheese everyone argues about was bolted on later.
Imo’s came last and mattered most. Ed and Margie Imo opened at Thurman and Shaw in the Shaw neighborhood in 1964 with $75 of used equipment and a fishing tackle box for a cash register, and it was one of the first carryout-and-delivery pizza parlors west of the Mississippi. Franchising began in 1979. There were 30 stores by 1985 and somewhere around 95 to 100 today across Missouri, Illinois and Kansas. Imo’s did not invent the style. Imo’s is the reason anyone outside Missouri has heard of it.
Nothing to do with pizza — St. Louis bakeries are worth a Saturday detour.
Is the pizza different on the Illinois side of the river?
The shape travels; the cheese does not always. A thin, square-cut pizza is normal on both sides of the Mississippi, but the Metro East sits between two separate thin-crust traditions — St. Louis-style to the west, and the Chicago and northern Illinois tavern-style tradition upstate — so a party-cut pie in Belleville, Edwardsville or Collinsville is roughly as likely to arrive with mozzarella as with Provel. Ask before you assume. That one question saves a lot of disappointed faces.
The Missouri side’s Italian-American cooking has a specific address behind it. Italian immigrants began settling the Hill in the 1890s, Lombards first and Sicilians after, drawn by the clay deposits discovered there in the 1830s. St. Ambrose Parish was founded in 1903 and its church built in 1926. That is the lineage the sweet, oregano-forward sauce comes out of.
One cross-river detail worth having: Imo’s frozen pizzas have been in Schnucks, Dierbergs, Straub’s and regional Walmart stores since October 2022, in seven varieties across thirteen states. Useful on a Tuesday, and not the same thing as the parlor version.
What is different about ordering pizza in Missouri versus Illinois?
Two things differ in ways you can actually check: sales tax and inspection records. On tax, a hot pizza is treated as prepared food in both states, so the parlor pie is taxed at the full rate either way. Missouri charges a reduced 1.225% state rate on groceries but the full 4.225% state rate plus local tax on food sold for immediate consumption. Illinois taxes prepared food at 6.25% state or higher.
The grocery aisle is where the two states now split. Illinois eliminated its 1% statewide grocery tax on January 1, 2026 — but the same law let municipalities and counties impose their own 1% grocery tax in its place, and more than half of them did, so plenty of Metro East shoppers saw no change at the register. Check your own city before assuming a frozen pie got cheaper this year.
Health inspections are public on both sides of the river, and you look them up in different places. In the city, the St. Louis Department of Health posts inspections from May 10, 2012 forward through the Healthspace system. St. Louis County’s Department of Public Health publishes its inspection reports online. In Illinois you go county by county: the St. Clair County Health Department runs a food service sanitation program with an inspection lookup, and Madison County inspects on a risk schedule — Category 1 establishments three times a year, Category 2 twice, Category 3 once. The Belleville News-Democrat also keeps a searchable Metro East database of St. Clair County inspections going back to 2022.
What does a pizzeria owner see that the customer doesn’t?
Cheese is the biggest single line on a pizzeria’s food-cost sheet, and it moves under you. USDA’s August 2026 projection put the 2026 average cheese price at $1.5750 a pound, down from $1.7950 in 2025 — real relief, except labor went the other direction. In the Restaurant365 survey of more than 5,000 restaurateurs cited in PMQ’s Pizza Power Report 2026, published December 22, 2025, 89% said labor costs rose and 91% said food costs rose. Most shops run 24% to 32% food cost, and the plain cheese pizza is the margin leader on the whole menu — which is exactly the pie third-party delivery apps take 15% to 30% of, with the effective cost often landing nearer 30% to 40% once the added fees are counted. A $22 pizza ordered through an app and a $22 pizza ordered on the phone are two very different pizzas to the person who made it.
PMQ counts roughly 75,000 pizzerias nationally and reckons more than half are independents — and the ones people find are the ones whose hours, phone number and menu are right in every place a hungry person looks, which is the unglamorous reason a shop takes ten minutes to get itself listed.
Related reading: the rest of what this city invented and sending a taste of it to someone.
Ready to settle the Provel argument at your own table? Browse pizza across the St. Louis metro on St Louis Near Me Directory, then order two thin-crust pies from one kitchen — one with Provel, one without — and let the room vote.
Frequently asked questions
What is Saint Louis style pizza?
A round, thin, cracker-crisp pizza built on yeast-free dough, topped with Provel rather than mozzarella and a sweeter, oregano-heavy sauce, then cut into three- or four-inch squares. All four markers have to be present. Drop the Provel or put yeast in the dough and you have thin-crust pizza — a fine thing, but a different one.
What is Provel cheese made of?
Cheddar, Swiss and provolone, blended and processed together with liquid smoke. It is a processed cheese rather than a natural aged one, and its defining trait is a low melting point — it goes soft and buttery instead of stringy. The smoke is what produces the flavor people either love or find alarming. Lactalis has held the trademark since acquiring Hoffman Dairy from Kraft in 2021.
Why is St. Louis pizza cut into squares?
Because the crust can take it. A yeast-free, rolled-thin base stays rigid under toppings, so a three-inch square holds flat in one hand. The cut itself is older than St. Louis pizza and is shared with Milwaukee and Chicago tavern pizza, where bar owners served squares on napkins so drinkers could keep a beer in the other hand.
Is St. Louis-style pizza crust really made without yeast?
Yes, and that is the defining structural difference. With no yeast there is no rise and no chew, so the dough gets rolled thin and bakes into something closer to a cracker than to bread. It is why the edge snaps instead of folding, and why a square of it carries a heavy load of toppings without drooping.
Can you buy Provel Cheese outside of St. Louis?
Not easily. Provel is rarely carried beyond this market — part of why the style never really traveled — and Lactalis sells the same product to foodservice buyers under the generic name St. Louis Style Pizza Cheese. Inside the region it is everywhere: Schnucks, Dierbergs and Hy-Vee all stock it, and Imo’s packages shredded Provel for retail.
Did Imo’s invent St. Louis-style pizza?
No, and the company’s own history does not claim it did. Ed and Margie Imo opened in 1964, nineteen years after Melrose Pizzeria was serving square-cut pizza in a North Sarah Street basement and eleven years after Luigi’s started building pies on Provel. What Imo’s did was scale it: franchising from 1979, 30 stores by 1985, and somewhere around 95 to 100 today across three states.
What is different about St. Louis pizza?
Three things, mostly: Provel in place of mozzarella, a sweeter and more oregano-heavy sauce, and an especially brittle yeast-free crust. The square cut it shares with tavern-style pizza elsewhere — a Chicago tavern pie has the same shape and the same crunch but none of those three — so the cut is not the local part. The cheese and the sauce are.
Who has the best St. Louis style pizza?
There is no settled answer, and anyone who says otherwise grew up on one particular pie. The style divides people on the cheese alone, so a ranking is really a preference. Judge a shop on the four markers instead, and on whether it hits them the same way every Friday.
How do I check a pizzeria’s health inspection around St. Louis?
It depends which side of the river you are on. City of St. Louis inspections from May 10, 2012 forward are searchable through the Healthspace system, and St. Louis County publishes its reports on the county public health site. In Illinois you go to the county: St. Clair County offers an inspection lookup, and Madison County posts its food sanitation program details, including how often each risk category is inspected.
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