1 lb. ground beef
1/2 c. chopped onions
1 lg. can refried beans
1 (12 oz.) can tomato paste
1 (12 oz.) can water
1 pkg. taco seasoning
3 tbsp. dry mustard
1 c. shredded cheese

Brown hamburger with onions; drain. Mix other ingredients in until heated. Store in crock pot or other dish you can heat up. Before serving add shredded cheese. Serve with nacho chips.