In a large bowl, whisk together mayo, both mustards, pickle juice, white wine vinegar, sugar, salt, and black pepper. Add in red and green cabbage and toss to coat thoroughly. Set aside.
make the beer brats
In a deep saucepan, heat beer until it simmers. Add in brats and cook for 8-10 minutes over low heat. Remove from saucepan and place in a large nonstick skillet with 1 tablespoon of butter until cooked through.
Toast hot dog buns and stuff with coleslaw and beer brats! Top with jalapeƱo and serve with french fries!