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1
In a large bowl combine green onions, whiskey, bread crumbs, Worcestershire sauce, melted butter, garlic, seasoned salt, crushed red pepper, and black pepper. Add ground beef and ground pork; mix well. Shape meat mixture into sixteen 1/2-inch-thick patties.
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2
Place 1 tablespoon of the Cheddar-Whiskey Filling on the center of each of eight of the patties (reserve remaining filling). Top with the remaining eight patties; pinch edges together to seal. In a storage container layer patties between sheets of waxed paper; cover and chill overnight.
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3
Tote patties, the remaining filling, lettuce, red onion, and tomato in an insulated cooler with ice packs.
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4
At the tailgating site, prepare grill (with a cover). For a charcoal grill, arrange medium-hot coals around a drip pan. Test for medium heat above pan. Place patties on grill rack over drip pan. Cover and grill for 10 minutes. Turn patties; cover and grill for 5 minutes. Top each patty with 1 tablespoon of the remaining filling. Cover and grill about 5 minutes more or until done (160 degrees F). (For a gas grill, preheat grill. Reduce heat to medium. Adjust for indirect grilling and grill as above.)
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5
Spread bottoms of rolls with barbecue sauce; top with burgers, lettuce, red onion, and tomato. Replace tops of rolls.
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6
Cheddar Whiskey Filling: In a food processor combine shredded cheddar cheese (8 ounces), finely chopped green onions, whiskey, Worcestershire sauce, and garlic, minced. Cover and process until nearly smooth.