Sometimes store-bought really is fine. From mayonnaise to pasta, here are seven things professional cooks prefer buying from ...

It is important for those with celiac disease or a gluten intolerance to know what foods are gluten-free. How about ketchup? Is it gluten-free?

Narrator: There are no rules for how the spell the word ketchup or for what defines it, so cooks experimented with a variety of ingredients to season meat, fish, bread, whatever needed flavor.

Ketchup—that cheerful red sauce sold in handy glass bottles—first came on the American market in the 19th century. But its ingredients were shockingly different than they are today.