01 -
Melt butter in a Dutch oven over medium heat. Add flour; cook, whisking constantly, 2 minutes. Gradually add ale and milk, whisking until smooth. Cook, whisking constantly, until mixture is thick and bubbly.
02 -
Gradually whisk in cheese and hot sauce until cheese is melted and sauce is smooth.
03 -
Shape beef into 6 patties; season lightly with salt and pepper. Cook patties in a large skillet over medium-high heat 5 minutes per side or until no longer pink in centers.
04 -
Bake or fry onion rings according to package directions.
05 -
Serve patties on toasted pretzel rolls with tomato slices, generous spoonfuls of cheese sauce, and onion rings.