These are a type of red bean (sometimes even referred to generically as red beans). They taste slightly sweet, but like most beans, are nutty and mild. Some people use them in baking, but they also go well with veggies like mushrooms and sweet potatoes that have both savory and sweet qualities.
Nutritional profile: Per ¼ cup (dried) 162 kcal, 9.78 g of protein, 0.26 g fat, 31 g carbohydrates, 6.25 g fiber, 2 g sugar, 32.5 mg of calcium, 617.5 mg potassium, 2.46 mg sodium.