Rio Ranchero Casserole

9 medium onions , diced
15 ibs ground beef
9 c mild or medium salsa
2 1/4 c taco seasoning
1 c brown sugar
4 T minced garlic
36 oz diced green chiles
4 1/2 tsp salt
2 1/4 tsp pepper
2 1/4 tsp red pepper
6 3/4 c water