About the Deep-Dish Spinach & Mushroom
History
Deep-dish pizza is often credited to Pizzeria Uno in Chicago, where Ike Sewell and Ric Riccardo opened their doors in 1943. The style emerged as a departure from thin-crust Neapolitan traditions, featuring a tall edge and inverted layering that placed cheese directly on the dough, with tomato sauce on top. This construction prevented the cheese from burning during the extended bake time required by the thick crust. The format became associated with Chicago's dining culture through the mid-20th century, and variations spread to other pizzerias throughout the city, each developing their own approaches to crust texture and topping ratios.
Technique
This dough uses 55% hydration, which produces a sturdy, biscuit-like crust capable of supporting heavy toppings without becoming soggy. The inclusion of 12% olive oil enriches the dough and aids browning, while the 20% semolina adds structure and a slight graininess. Baking at 450F for 35 minutes on a deck allows the thick crust to cook through while developing color on the exterior. The cheese goes in first, creating a moisture barrier between the dough and wetter toppings. The raw crushed tomato finishes on top, concentrating as it reduces during the long bake and protecting the cheese below from direct heat.
Ingredient notes
The 80/20 blend of all-purpose and semolina flour balances tenderness with enough strength to hold the deep structure. Low-moisture mozzarella is sliced rather than shredded to create an even layer that melts without releasing excess water. Spinach must be wilted and thoroughly squeezed to remove moisture that would otherwise steam into the crust. Dry-sautéing the cremini mushrooms evaporates their water content before assembly, concentrating their flavor. The crushed tomato remains uncooked when added, relying on oven heat to develop its flavor, while garlic crushed into the sauce provides aromatic depth. Parmigiano-Reggiano adds a sharp, salty finish.
Variations
Stuffed pizza, sometimes called double-crust or stuffed deep-dish, adds a thin top layer of dough over the cheese and vegetables before the tomato sauce goes on. Some Chicago pizzerias use a cornmeal-dusted pan or incorporate cornmeal into the dough itself for added texture and easier release. Spinach and mushroom is a common vegetarian configuration, though sausage, pepperoni, and bell peppers appear frequently in meat-focused versions. Pan pizza, while similar in appearance, typically uses a different dough formula with higher hydration and less oil, resulting in a lighter, airier crumb than the denser deep-dish style.
When to serve & pairings
Deep-dish pizza suits casual gatherings and cold-weather meals due to its substantial nature and long baking time. A simple green salad with vinaigrette provides contrast to the rich, heavy pie. Beer, particularly lagers or pale ales, cuts through the cheese and oil, while lighter red wines like Chianti or Barbera offer enough acidity without overwhelming the vegetables. Because one slice is quite filling, this style works well as the centerpiece of a meal rather than alongside multiple dishes. The extended bake time makes it better suited to planned dinners than spontaneous weeknight cooking.