Beef chimichangas

1 med size roast beef-cook 12 hours in crock pot

2 t oil

1 4-oz can diced green chilis

2 10-oz can green chili salsa

1/4 t garlic powder

4 T flour

1 t cumin

cook roast in crock pot for 12 hours.  don't add salt or water.  drain meat-reserving juices.  cool meat the shred.  about 1 hour before serving in large skillet-heat oil-saute chopped onions for one minute over medium low heat.  stir in remaining meat juices-add shredded beef.  cook for 5 min until thick