Place beans, oil, 3 quarts water, and 1 teaspoon salt in a 6-to-8-quart pressure cooker.
Stovetop:
See AlsoCuban Beans & Rice: Four VariationsBeans & Health Overview | Bean InstituteThe Benefits of Black Beans Will Blow You AwayBlack bean powder jjajang OTTOGI 100gSecure lid. Bring to high pressure over medium-high heat; reduce heat to maintain pressure and cook 20 minutes. Remove from heat and quickly release pressure (loosely cover vent with a clean kitchen towel), then remove lid.
See AlsoHealth Benefits of Black BeansElectric: Secure lid. Manually set cooker to 25 minutes and let it come to pressure. Once time is complete, turn off and quickly release pressure (loosely cover vent with a clean kitchen towel), then remove lid.
Let beans stand in cooking liquid 30 minutes; drain.
Cook's Notes
Beans and grains tend to foam up in a pressure cooker; to avoid a mess, you should lightly cover the vent with a clean kitchen towel when releasing the steam.