Ingredients:

• 2 Tbsp butter
• 1 onion, sliced
• 1/2 cup celery, chopped
• 3/4 cup water
• 1 cup ketchup
• 2 Tbsp vinegar
• 2 Tbsp lemon juice
• 2 Tbsp worcestershire sauce
• 2 Tbsp brown sugar
• 1 tsp salt
• 1/4 tsp pepper
• 1 tsp dry mustard
• 1/2 lbs chipped ham