Alison's Slow Cooker Vegetable Beef Soup Recipe

1 ½ pounds cubed beef stew meat

2 cups water

1 small onion

chopped

1 (28 ounce) can crushed tomatoes

1 (16 ounce) package frozen mixed vegetables

2 potatoes

peeled and cubed

10 cubes beef bouillon

crumbled

2 teaspoons ground black pepper

1 tablespoon salt

1 tablespoon dried basil