the sauce on top of the pizza is called tomato sauce. Some Italian Americans call tomato sauce, gravy.
pasta meatballs cheese sausage tomato sauce
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Americans call sausages sausages. Regional specialties and foods specific to particular ethnic groups will have their own names, such as Cajun sausage, saucisson (French), chorizo (Spanish), countless German and Baltic style-sausages, English-style sausages, and so on and on and on. But they're all called a sausage.
Bolognese
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As the name "Tomato sauce" suggests, tomato sauce is a sauce who's main ingredient is tomatos.
Tomato Sauce....
tomato sauce
in a factory that makes tomato sauce.
A hotdog is a hot sausage placed inside a finger bun, with onions, tomato or mustard sauce spread on it.