How do you fix a broken pizza?
Why this joke works
Paste as Ingredient and Repair
Tomato paste belongs on a pizza, while ordinary paste can stick broken things together. The setup frames pizza as an object needing repair rather than food needing a recipe. Ask the question with practical concern, then answer without emphasizing “paste.” Its everyday repair meaning supplies the second half of the joke. Tomato paste is a thick tomato ingredient, so the same answer belongs in a recipe and in the imagined repair kit.
A closer look
An Ingredient Becomes a Repair Supply
“Paste” can mean an adhesive used to join broken material, while tomato paste is a concentrated food ingredient. The setup describes pizza as though it were a damaged object, making glue-like repair plausible. The answer then stays inside the kitchen without surrendering the repair meaning. Because tomato paste may already be associated with pizza sauce, the proposed fix sounds absurdly appropriate rather than random.
Fact behind the joke
Tomato Paste Is Concentrated by Removing Water
USDA standards define tomato paste as a concentrated product made from tomato ingredients and set minimum soluble-solids levels for the finished food. Evaporation removes much of the water, producing a thicker ingredient than ordinary tomato juice or many sauces. That thickness supports the joke’s adhesive image, but real tomato paste adds flavor and body; it cannot reconnect a sliced or torn pizza.