While many ingredients on a Pizza change, the crusted dough (either thick or thin) and the tomato sauce always return.
Mozzarella is certainly basic to any pizza, but the main ingredient in pizza is the crust - pizza dough.
Concrete
The shake's main ingredient is milk.
The main ingredient in yoghurt is milk.
Flour ( pasta ) is the main ingredient
Sausage is the main ingredient.
Beijing food does not have a main ingredient. Anything could be the main ingredient. It depend on the food.
NYC Water
Sugar is the main ingredient of candy
Cabbage is the main ingredient in sauerkraut.
Main ingredient is starch
The main ingredient in ham salad is ham.
Well n ot alot of pizza and pizza wasnt even made yetNo, as the main ingredient of a pizza is tomato sauce and the Romans did not have tomatoes. However they had all the other ingredients, such as cheeses, sausage, mushrooms and other veggies. Their cooks could possibly have concocted something pizza-like, but not the real thing.