Instant Pot Instructions: 

1. Turn Instant Pot to saute setting. When display says HOT add in the oil and swirl around. Place the bratwursts into the pot and let it brown for about 3 minutes on one side. Flip the sausages over and brown on the other side for 3 more minutes. Add the onions into the pot and saute for 3 minutes.
2. Use the juices from the onions to scrape the bottom of the pot to release the browned bites. Pour in the broth and continue to scrape and release anything sticking to the bottom of the pot.
3. Add in the cabbage, pepper, salt, garlic, potatoes, vinegar and Worcestershire sauce. 
4. Cover Instant Pot and secure the lid. Make sure valve is set to sealing. Set the SOUP button to 4 minutes. When time is up let pot sit for 5-10 minutes and then move valve to venting. Remove the lid.
5. Use tongs to remove the brats. Slice them into quarter inch rounds and stir them back into the pot. Ladle into bowls and serve. 

Slow Cooker Instructions: 

1. Heat a pan over medium high heat. Add in the oil and swirl around. Place the bratwursts into the pan and let it brown for about 3 minutes on one side. Flip the sausages over and brown on the other side for 3 more minutes. Add the onions into the pot and saute for 3 minutes. Move onions and brats to the slow cooker. 
2. Add in the broth, cabbage, pepper, salt, garlic, potatoes, vinegar and Worcestershire sauce. 
3. Cover and cook on low for 6 hours.
4. Use tongs to remove the brats. Slice them into quarter inch rounds and stir them back into the slow cooker. Ladle into bowls and serve.