Stuffed Cabbage Casserole for the crock pot

This was a tasty and easy way to have stuffed cabbage (only it is unstuffed!) . I found this in Best of Country SLow Cooker recipes. (for a non-meat vegetarian stuffed cabbage that I may try in the crockpot at some point- go here http://nannykimsrecipes.blogspot.com/2010/10/vegetarian-stuffed-cabbage.html) but for the meat one in the crock see below.

1 pound of ground beef or ground turkey
1 onion , chopped
4 cups chopped cabbage (I used the fresh slaw cabbage--alread sliced up)
1 medium green pepper, chopped (I prefer more of this--tastes like stuffed peppers with more)
1 cup instant rice (I used the instant brown rice)
1 cup water
1 can (6 oz) of tomato paste
1 can (14 -1/2 oz) diced tomatoes, undrained
1/2 cup ketchup
2 tablespoons of vinegar (I used the apple cider kind)
1-2 tab. sugar (I just used 1--for more tartness)
1 tab. Worcestershire sauce
1-1/2 tsp salt (I use much less--more like 1/2 tsp)
1/2 tsp pepper
1/4 tsp garlic powder

In a skillet, cook the meat and onions until no longer pink, drain. Place it in the slow cooker; add the cabbage, green pepper and uncooked instant rice. In a bowl, combine the water and tomato paste. Stir in the remaining ingredients. Pour over the meat mixture and MIX WELL. Cover and cook on low 4-5 hours or until rice and vegetables are tender. Makes 4-6 servings.