1. Combine the beef with the breadcrumbs, egg, Worcestershire and season to taste with salt and pepper. Form into patties, and grill for 4-6 minutes per side. Set aside.
2. Add the butter, avocado oil and onions to a grill pan. Allow them to cook in a 400°F grill for about a half hour before adding the burgers on top, balsamic vinegar and both cans of Partake IPA. Shut the lid, and allow them to cook for another half hour.
3. Serve on a bun with your favourite condiments and toppings.
