Savory pork bratwursts are browned first, then slowly cooked with sauerkraut, golden potatoes, onions, garlic, aromatic seeds, and German-style lager. The extended slow-cooking time produces tender potatoes, juicy sausages, and a richly flavored sauerkraut mixture.
Brown the bratwursts. Heat a cast-iron skillet with a small amount of oil over medium heat. Once the pan is hot, add the 5 pork bratwurst links. Sear the sausages, turning them periodically, until each side develops an even brown exterior. Remove the browned bratwursts from the skillet and reserve them.
Build the slow-cooker base. Arrange the 1 pound of sauerkraut, halved golden potatoes, and sliced yellow onions in the crockpot.
Add the seasonings. Distribute the smashed garlic cloves, bay leaves, mustard seeds, and caraway seeds throughout the sauerkraut and vegetable mixture.
Add the sausages and beer. Set the browned bratwursts into the sauerkraut mixture, gently nestling them among the other ingredients. Pour the 12-ounce German-style lager evenly over the contents of the slow cooker so everything is thoroughly moistened.
Slow-cook until tender. Cover the crockpot and cook on low for 8 hours, or until the potatoes are tender and the bratwursts are completely cooked through while remaining juicy.
After cooking, remove the lid and allow the dish to rest for a few minutes before serving. This brief resting period gives the combined flavors time to settle and meld.