Make Easy Beer Brats: brown bratwursts, simmer in malty lager with peppers and onions, and serve in toasted rolls.
Heat a heavy cast-iron pan until just hot, add a splash of avocado oil, and lay the bratwurst links in a single layer. Cook slowly over moderate heat so the skins tighten and take on an even, warm brown — you want color and rendered fat, not an aggressive sear. Turn the links gently so each side has a uniform golden-brown crust and the surface shows tiny beads of natural juices. Transfer the browned links to a plate and let them rest briefly while you use the same pan for the vegetables.
Add the thinly sliced sweet onion and red bell pepper to the still-warm pan and sauté, stirring occasionally. Cook for several minutes until the vegetables are translucent and starting to pick up soft caramelized edges — the onion will become ribbon-like and glossy while the pepper softens but keeps its saturated red. Season lightly with salt and fresh-ground black pepper so the vegetables begin building the savory base for the braising liquid.
Nestle the browned bratwursts back into the onion-and-pepper bed, pour in the malty lager, and bring to a gentle simmer. Maintain a low bubble so the beer reduces by roughly half and concentrates into a glossy, amber gravy that clings to the sausages and vegetables. Skim any surface foam, taste and adjust with salt and pepper, and let the mixture finish until the brat skins are taut, the vegetables deeply flavored and the pan juices are slightly syrupy.

Split and lightly toast the rolls, then place each warm brat into a roll and crown with a generous mound of the softened peppers and caramelized onions. Spoon a little of the reduced beer gravy over the top so the sausages gleam and the bun soaks a hint of broth. Serve with optional small ramekins of ketchup, spicy brown mustard, yellow mustard and sauerkraut on the side for people to finish to taste.
