Step 1

Place onions in a 5-quart (or larger) slow cooker; add ribs and bay leaf. Combine the beer, brown sugar, mustard, tomato paste, thyme, bouillon, salt and pepper. Pour over meat. Cover and cook on low for 8-10 hours or until meat is tender.

Step 2

Remove meat and vegetables to a serving platter; keep warm. Discard bay leaf. Skim fat from cooking juices; transfer juices to a small saucepan. Bring liquid to a boil. Combine flour and water until smooth. Gradually stir into the pan. Bring to a boil; cook and stir for 2 minutes or until thickened.

Step 3

Set everything in the Instant Pot and set it for 45 minutes at high pressure, followed by 15 minutes of natural release time for the cooking time.

Step 4

Remove meat and vegetables to a serving platter; keep warm. Discard bay leaf. Skim fat from cooking juices; transfer juices to a small saucepan. Bring liquid to a boil. Combine flour and water until smooth. Gradually stir into the pan. Bring to a boil; cook and stir for 2 minutes or until thickened.