Black Bean Soup

Easy and tasty, makes great leftovers!

2 T oil
1 T butter
1 small onion, diced
2 carrots, diced
2 ribs celery, diced
2 cloves garlic, minced
1 t red pepper flake
2 26 oz cans black beans
6 C water or broth
cilantro
salt and pepper

Cook vegetables in oil until browned, add garlic, red pepper, and salt, cook 2 min more. Add black beans and water or broth, bring to a boil then reduce heat and simmer 20 min. Add a small handful of chopped cilantro. Garnish with sour cream and/or avocado.