Easy 1 Pot Black Beans

Name: Easy 1-Pot Black Beans
Ingredients: 1 pound dry black beans* (rinsed and sorted // for soaking, see notes); 3/4 cup white or yellow onion (gently peeled, not chopped); 5 cloves garlic (smashed and peeled // but not diced); 1 strip kombu* (seaweed to improve digestibility); Water; Vegetable broth*; Sea salt + black pepper to taste ADD INS (optional); 1 tsp ground cumin (for smokiness); 1-2 chipotle peppers in adobo sauce (for heat)