1: Smell actually accounts for a lot of what we think of as taste. When food is hot, smells are more mobile and so things smell more strongly, which makes us experience them as tasting stronger as well.
2: Some ingredients of pizza are somewhat temperature dependant. Cheese, for example, is a complicated mix of fats, proteins, and salts. When it’s cold, they’re mixed together in a solid mass but when it is hot, the fat and water melts before the proteins and bring the salt along. So you get an oilier, saltier taste with melted cheese even though it’s the same ingredient.
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