Bratwurst with caramelized onions is an easy skillet dinner built around juicy pork sausages, slowly browned onions, toasted buns, and mustard. The onions cook until soft, deep golden, and almost jammy, while the bratwurst stays juicy inside with a browned casing.
This recipe makes 5 servings and takes about 50 minutes from start to finish. Cook fresh pork bratwurst to an internal temperature of 160°F before serving.
Table of Contents
Table of Contents
Why This Bratwurst with Caramelized Onions Works
The key to this recipe is cooking the onions separately before browning the bratwurst. That gives the onions enough time to develop sweetness without steaming in the moisture released by the sausages.
A combination of butter and olive oil gives the onions richness while helping them cook evenly. A small amount of water prevents the skillet from scorching if the browned bits become too dark.
The bratwurst is first gently cooked with water, then browned after the water evaporates. This helps the center cook through before the casing becomes too dark.
Ingredients for Bratwurst with Caramelized Onions
You need only a short list of ingredients for this skillet dinner.
- 5 fresh pork bratwurst links, about 20 ounces total
- 3 large yellow onions, thinly sliced, about 1 pound
- 1 tablespoon unsalted butter
- 1 tablespoon olive oil
- 1/4 teaspoon kosher salt
- 1/4 teaspoon freshly ground black pepper
- 1/2 cup water
- 5 hot dog or bratwurst buns
- 1/4 cup spicy brown mustard
Yellow onions work especially well because their natural sweetness becomes more noticeable as they slowly brown.
Use fresh, uncooked pork bratwurst rather than fully cooked sausage for the cooking method below.
How to Make Bratwurst with Caramelized Onions
1. Caramelize the Onions
- Heat the butter and olive oil in a large skillet over medium heat.
- Add the sliced onions, kosher salt, and black pepper. Stir well, then reduce the heat to medium-low.
- Cook for 22 to 25 minutes, stirring every few minutes, until the onions are very soft and deep golden brown. If the bottom of the skillet begins to darken too quickly, add 1 tablespoon of the measured water and scrape up the browned bits.
- Transfer the caramelized onions to a plate and keep them warm.
2. Cook the Bratwurst
- Return the skillet to medium heat.
- Add the bratwurst and the remaining water. Cover and cook for 6 to 8 minutes, turning the sausages once halfway through.
- Remove the lid. Continue cooking for another 6 to 8 minutes, turning frequently, until the water has evaporated, the bratwurst is browned on all sides, and the center of each sausage reaches 160°F.
Fresh pork bratwurst is made from ground meat, so temperature matters more than judging doneness only by the color of the casing. The USDA safe minimum internal temperature chart recommends 160°F for ground pork.
3. Bring the Onions and Bratwurst Together
- Return the caramelized onions to the skillet.
- Cook for about 2 minutes, gently moving the onions around the bratwurst so they pick up the browned flavor from the pan.
- The onions should be soft, glossy, and deep golden rather than pale or crunchy.
4. Toast the Buns
- Transfer the bratwurst and onions to a plate.
- Place the buns cut-side down in the warm skillet for 1 to 2 minutes, just until lightly toasted.
5. Assemble and Serve
- Spread the spicy brown mustard among the toasted buns.
- Place one bratwurst in each bun and top each serving with about 1/3 cup of the caramelized onions.
- Serve immediately while the bratwurst is hot and the onions are soft.
Tips for Deep Golden Caramelized Onions
Keep the heat at medium-low once the onions begin to soften. High heat can darken the edges before the onions have time to become tender and sweet.
Stir every few minutes rather than constantly. Leaving the onions against the skillet for short periods helps them develop color.
If the skillet becomes dry or the browned bits look close to burning, use a tablespoon of the measured water to loosen the pan.
Do not rush the final few minutes. The onions are ready when they are noticeably reduced in volume, very soft, and a rich golden-brown color.
How Do You Know When Bratwurst Is Done?
Fresh pork bratwurst is done when the thickest part reaches 160°F on an instant-read thermometer.
Insert the thermometer into the center of the sausage without pushing it completely through to the skillet.
The casing should also be browned, but color alone is not a reliable way to determine whether fresh sausage is safely cooked.
What to Serve with Bratwurst and Caramelized Onions
Bratwurst and onions pair naturally with simple sides that balance the richness of the sausage. Try roasted potatoes, German-style potato salad, cabbage, sauerkraut, a crisp green salad, or roasted vegetables.
For another sausage-forward dinner with easy cleanup, try our sheet pan jambalaya with shrimp.
If you want another hearty one-pan weeknight meal, our ground beef and zucchini skillet is another practical option.
Storage and Reheating
For the best leftovers, store the cooked bratwurst and caramelized onions together in an airtight container and keep the buns separately.
Refrigerate the cooked bratwurst and onions for up to 3 to 4 days.
To reheat, place the bratwurst and onions in a covered skillet over medium-low heat with 1 to 2 tablespoons of water. Heat for about 5 to 7 minutes, turning the sausages occasionally, until hot throughout. Previously cooked leftovers should reach 165°F when reheated.
Toast a fresh bun separately before assembling so it does not become soggy.
Bratwurst with Caramelized Onions
Ingredients
- 5 fresh pork bratwurst links about 20 ounces / 567 g total
- 3 large yellow onions thinly sliced (about 1 pound / 450 g)
- 1 tablespoon unsalted butter
- 1 tablespoon olive oil
- 1/4 teaspoon kosher salt
- 1/4 teaspoon freshly ground black pepper
- 1/2 cup water
- 5 hot dog or bratwurst buns
- 1/4 cup spicy brown mustard
Instructions
- Heat the butter and olive oil in a large skillet over medium heat. Add the sliced onions, kosher salt, and black pepper, then reduce the heat to medium-low. Cook for 22 to 25 minutes, stirring every few minutes, until the onions are very soft and deep golden brown. If the skillet begins to darken too quickly, add 1 tablespoon of the measured water and scrape up the browned bits. Transfer the onions to a plate and keep warm.
- Return the skillet to medium heat. Add the bratwurst and the remaining water. Cover and cook for 6 to 8 minutes, turning once halfway through. Remove the lid and cook for another 6 to 8 minutes, turning frequently, until the water has evaporated, the sausages are browned on all sides, and the thickest part of each bratwurst reaches 160°F.
- Return the caramelized onions to the skillet. Cook for about 2 minutes, gently moving the onions around the bratwurst so they pick up the browned flavor from the pan. The onions should be soft, glossy, and deep golden.
- Transfer the bratwurst and onions to a plate. Place the buns cut-side down in the warm skillet for 1 to 2 minutes, until lightly toasted.
- Divide the spicy brown mustard among the toasted buns. Place one bratwurst in each bun and top each serving with about 1/3 cup caramelized onions. Serve immediately.
Notes
- Keep the onions over medium-low heat so they soften and caramelize without burning.
- If the skillet becomes too dry while the onions cook, use a tablespoon of the measured water to loosen the browned bits.
- Always verify fresh pork bratwurst with an instant-read thermometer; the center must reach 160°F.
- Store cooked bratwurst and onions refrigerated in an airtight container for 3 to 4 days.
- Store buns separately to prevent them from becoming soggy.
- Nutrition information is an estimate per serving and assumes one bratwurst, one bun, caramelized onions, and the listed portion of mustard.
Nutrition
Frequently Asked Questions
What is the best onion for bratwurst?
Yellow onions are ideal because they become soft and naturally sweet as they caramelize. Sweet onions also work, but they can become noticeably sweeter.
Do you need beer to cook bratwurst?
No. This recipe uses water to gently cook the fresh bratwurst before browning, so beer is not necessary for juicy sausages or well-caramelized onions.
What temperature should bratwurst reach?
Fresh pork bratwurst should reach 160°F in the center. Check the thickest part with an instant-read thermometer before serving.
Can I make the caramelized onions ahead of time?
Yes. Cook the onions as directed, refrigerate them in an airtight container, and reheat them gently in the skillet before serving with the bratwurst.
How long does cooked bratwurst keep in the refrigerator?
Store cooked bratwurst and caramelized onions in an airtight container in the refrigerator for 3 to 4 days. Keep the buns separate and reheat the bratwurst and onions to 165°F.
