Pizzas are based on what used to be a primitive peasant-style snack meal made of bread dough with savoury ingredients sprinkled on top and baked in an oven fired with wood. From such humble Italian origins they now enjoy world-wide favour and have been made slightly more sophisticated and sufficiently substantial to constitute a main dish. They can be made in the form of a flan using pastry, or bread dough, and the depth of filling increased to merit the title of deep-dish pizza.
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