Have you ever noticed a large, rocky bowl at Mexican restaurants, grocers, or while traveling to the country? These kitchen tools are traditionally made of volcanic rock and belong on a sturdy shelf: my eight-inch diameter molcajete weighs in at ten pounds (yes, you could use your molcajete to do bicep curls when you’re not mixing up salsa). The molcajete has two parts—the bowl with three feet formed on the bottom for a sturdy base and a pounding tool, called a tejolote, which looks like an oblong rock.