Buy Mexican Black Beans 25kg / Frijoles Negros from MexGrocer store.
Beans are the perfect companion to practically all Mexican food, especially when refried or whole. Boil them to cook them and then use them in other dishes or re-fry them. You can also enjoy them as a snack with tortilla chips.
You can find a recipe for Black Turtle Beans / Frijoles Negros here.