INGREDIENTS
1 tsp
black pepper
1/3 cup
chicken stock
1/2 cup
dry bread crumbs
2 extra larges
eggs
1 tsp
fresh thyme leaves
2 1/2 lb
ground chuck
1/2 cup
ketchup
2 tsp
kosher salt
1 tbsp
olive oil
1 tbsp
tomato paste
3 tbsp
worcestershire sauce
3 cups
yellow onions