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Grill brats inside or outside until nice and brown. No need to pre-boil them!
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In a skillet, add 1 teaspoon canola oil. Heat to medium high. Add peppers and onions, season with grill seasoning. 21 Seasoning Salute from Trader Joe's is great. Cook for 6-7 minutes to caramelize.
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Reduce heat to medium. Slowly pour the whole bottle of beer over the peppers and onions. Cover and bubble for 10 minutes, until beer has cooked down.
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Add mustard and cheese. Stir to melt.
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Using tongs, put pepper/onion mixture on top of brats. Place in bun. Enjoy!