Don't be fooled by the short ingredients list; these vegetarian black beans have a surprisingly complex flavor. Since I can't use a meaty bone or lard for a boost, I rely on my trusty trinity of Sherry, balsamic vinegar, and soy sauce, three power ingredients that play well together. The pressure cooker makes cooked-from-scratch beans easily feasible for a spur-of-the-moment supper, though I still prefer to cook up a pot on the weekend; beans thicken as they stand, so by making them ahead and thinning them before serving, I actually get more. This recipe serves as the base for two different meals: I set aside half for flavorful beans and rice and purée the other half into a hearty soup spiked with additional Sherry and lime juice.
·Beans can be cooked in about one third of the time in a 6- to 8-quart pressure cooker. Follow recipe, combining beans with onion, oil, water, and salt in pressure cooker. Seal pressure cooker with lid and cook at high pressure, according to manufacturer's instructions, until beans are tender, 30 to 45 minutes. Put pressure cooker in sink (do not remove lid) and run cold water over lid until pressure goes down completely.
·Beans improve in flavor if cooked at least 8 hours ahead. Chill, uncovered until completely cooled, then covered up to 1 week, or freeze up to 3 months. Beans thicken considerably as they stand, so thin with water when reheating over moderately low heat.
