Njahi Kenyan Black Beans in Coconut Sauce

Name: Njahi (Kenyan Black Beans) in Coconut Sauce
Ingredients: 2 cups (13 ounces; 370g) njahi beans (see note); Diamond Crystal kosher salt; 1/4 cup (60ml) neutral oil such as avocado oil, plus more if needed; 1/2 medium red onion (5 ounces; 150g), finely diced; 1/2 large green bell pepper (4 ounces; 110g), stemmed, seeded, and finely diced; 6 medium garlic cloves, thinly sliced; 4 scallions, ends trimmed and thinly sliced; One 1-inch piece ginger (1/3 ounce; 10g), peeled and minced; 1 teaspoon cumin seeds; 3 tablespoons (40g) tomato paste; 2 teaspoons garam masala; 1 jalapeño, stemmed, seeded, and minced; 1 teaspoon ground paprika; 1/2 teaspoon ground turmeric; One 13.5-ounce (400ml) can coconut milk; 1/4 cup roughly chopped cilantro leaves and tender stems