You’re giving your spice rack a much-needed clean-out and you come across a mystery ingredient: cream of tartar. Huh, looks like I’ve never touched this one, you think. But don’t toss it in the trash ...

These sweet little swirls are light as can be. They're all you need after a big, special dinner. —Jenni Sharp, Milwaukee, ...

The Washington Post staff recently answered questions about all things edible. Here are edited excerpts from that chat. Q: I am so confused. I read that cream of tartar is a leavening agent but that ...