Step 1

Preheat oven to 325 degrees Fahrenheit (170 degrees Celsius).

Step 2

Rinse meat and pat dry. Lay onion rings on the bottom of a medium-sized roasting pan and place the brisket on top.

Step 3

Combine olive oil, garlic, salt, and pepper. Smear evenly over the meat. Pour beer into the pan around the meat.

Step 4

Combine all barbecue sauce ingredients in a small bowl and pour evenly over the brisket.

Step 5

Cover well with aluminum foil. Bake for four hours.