What to look for
Tubes are convenient for small amounts; cans are economical when a recipe uses most of one. Check for added salt and flavorings.
Store it thoughtfully
Refrigerate opened paste in a clean covered container or freeze tablespoon portions. Do not store leftovers in an opened metal can.
How to use it
Cook it in oil for a minute or two until it darkens slightly and smells sweet, then add liquid. This removes the raw canned edge.
When you need a substitute
Tomato sauce or crushed tomatoes are much thinner and less concentrated, so they require more volume and reduction. Ketchup adds sugar and vinegar.
A common pitfallTomato paste burns quickly on a dry, very hot pan; stir and add liquid before the browned film turns black.
Substitutions change flavor, texture, and sometimes safety or structure. Check the recipe and product labels, especially for dietary needs.
