Slow Cooker Red Beans and Barley

uncooked pearl barley

1 cup(s), rinsed (use long-cooking variety; not pearled barley)

uncooked red onion(s)

1 small, finely chopped

uncooked celery

1 rib(s), large, chopped

garlic clove(s)

1 medium clove(s), minced

red pepper flakes

¼ tsp, crushed, or more to taste

canned kidney beans

15 oz, drained and rinsed

canned crushed tomatoes

28 oz

bay leaf

2 leaf/leaves

fat free chicken broth

3 cup(s), or vegetable broth

black pepper

¼ tsp

table salt

1 tsp