Make Easy Beer Brats tonight: brown brats, simmer in lager, and serve in toasted rolls for juicy, crowd-pleasing sandwiches.
Heat a heavy cast-iron pan until it is hot enough to sizzle, add a tablespoon of avocado oil, and lay the bratwurst links in a single layer. Cook them slowly over medium heat so they brown rather than sear — let each side develop an even golden-brown color with a few darker caramelized spots, then flip and repeat until both sides are evenly colored and plump. Remove the browned links and rest them briefly on a clean plate so the juices settle; keep the fond in the pan for flavor.
Using the same pan with the flavorful fond, add the sliced sweet onion and red bell pepper and cook, stirring occasionally, until the onion becomes translucent and the edges pick up a soft golden hue and the pepper strips soften but keep their red vibrancy. This step is about coaxing sweetness and a little caramelization from the vegetables while preserving their glossy texture and bright color — cook for roughly five to seven minutes until they feel tender and slightly jammy.

Nestle the browned bratwursts back into the bed of softened onions and peppers and pour in the malty lager so the sausages are partly submerged. Bring the liquid to a gentle simmer and cook until it reduces by about half, concentrating into a glossy, savory beer gravy that clings to the sausages and vegetables. Skim any foam if it forms, taste and season the sauce with salt and freshly ground black pepper, and let the mixture finish until the gravy is rich and slightly syrupy.
Place each cooked bratwurst into a split, lightly toasted bun and pile on the warm caramelized onions and red pepper strips, spooning a little of the beer gravy over the top so it glistens. Offer optional condiments (ketchup, spicy brown or yellow mustard, sauerkraut) in small jars on the side for guests to add as they like. Serve immediately while the sausage is juicy, the bun is soft and slightly crisp at the edges, and the glossy onions provide sweet-savory contrast.
