Spicy Sweet and Sour Cabbage Soup

This is a new soup recipe that I have been working on. I have been wanting a cabbage soup recipe for years, this is just what I've been waiting for! If you don't want it spicy leave out the crushed red pepper, or add less. -Sarah

2 T. butter
1 large onion, chopped
2 cloves garlic, minced
2 T. brown sugar
6 cups chopped cabbage
1 1/2 cups crushed tomatoes
2 T. apple cider vinegar
6 cups chicken broth
salt to taste
3/4 t. crushed red pepper flakes

• Melt butter in stock pot. Add onion and cook till translucent. Add garlic and cook, being careful not to burn.
• Stir in brown sugar and cabbage, stirring till cabbage gets softer.
• Stir in tomato sauce, vinegar, and chicken broth. Add salt and crushed red pepper, if using.
• Bring soup to a boil and turn heat down. Simmer for 20 minutes, till cabbage is cooked.