5 lb seasoned boneless beef roast
1 large yellow onion - quartered
5 whole garlic cloves
1/4 c. ketchup
1/2 c. red wine vinegar
1/4 c. worcestershire sauce
1 Tbs dijon mustard
Place all ingredients in a medium Crock-Pot. I set mine on low for 10 hours.
Ciabatta rolls
Swiss cheese slices
Slice ciabatta rolls in half and bake on a half sheet at 375 for 3-5 minutes until toasty. Place a slice a swiss cheese on each roll and pile the shredded roast beef on top.