1/2 c. onion, cut up fine
1 1/2 tbsp. butter
1 c. ketchup
1/2 c. water
1/4 c. lemon juice
6 tbsp. brown sugar, or to taste
1 tbsp. Worcestershire sauce
1 1/2 tbsp. vinegar
1/2 tsp. salt
1 tbsp. mustard
Dash of pepper

Simmer onion with butter until onions clear, do not brown onions. Set aside. Mix ketchup, water, lemon juice, brown sugar, Worcestershire sauce, vinegar, salt, mustard, and pepper in saucepan. Then add cooked onions and butter and cook slow for 45 minutes. Add to meat and simmer 30 minutes.