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In a mixing bowl, combine the beans, soup, milk, soy sauce, Worcestershire sauce, black pepper, 2/3 cup of the onion rings, and red pepper, if using. Transfer to a 1-1/2 quart casserole dish.
When ready to cook, start the Traeger grill on Smoke with the lid open until the fire is established (4 to 5 minutes). Set the temperature to 350F and preheat, lid closed, for 10 to 15 minutes.
Cook the casserole until the filling is hot and bubbling, 25 to 30 minutes. Top with the remaining onions and cook for 5 to 10 minutes more, or until the onions are crisp and beginning to brown.
The History of the Barbecue