Ingredients
Method
- Whisk together mayonnaise, Guinness, Dijon mustard, and garlic powder in a small bowl. Refrigerate while you prepare the other components to allow the flavors to marry.
- Combine flour and salt in a medium bowl. Gradually whisk in the Guinness until smooth - the batter should coat the back of a spoon but still drip easily. Let it rest for 5 minutes while the flour hydrates.
- Heat oil to 375°F in a heavy pot or deep fryer. Separate onion rings and dip each one in the beer batter, letting excess drip off. Fry in batches for 2-3 minutes until golden brown and crispy. Drain on paper towels and season with salt immediately.
- Gently shape ground beef into 4 patties, making a slight indent in the center to prevent puffing. Season generously with salt and pepper. Cook in a hot skillet or grill for 3-4 minutes per side for medium doneness. Add cheese during the last minute of cooking, covering to help it melt perfectly.
- Toast the buns lightly for extra texture. Spread Guinness mayo on both halves, then layer lettuce, tomato, the cheese-topped patty, and generous pile of crispy onion rings.
Notes
Make the Guinness mayo ahead of time - it tastes better after the flavors meld in the fridge for an hour. Don't overwork the ground beef when forming patties. Make sure oil temperature is correct for onion rings (375°F). Toast the buns to prevent sogginess. Refrigerate leftover patties for up to 3 days and store onion rings separately to maintain crispiness.
