This Keto Beef and Cabbage Soup is ideal for meal prep and tastes even better the next day as the flavors continue to develop. Store leftovers in airtight containers in the refrigerator for up to 5 days or freeze for up to 3 months, leaving a little headspace for expansion. Reheat gently on the stovetop over medium low heat or in the microwave at medium power to preserve the texture of the cabbage and prevent the beef from drying out. For an even higher fat macro, feel free to swirl in a spoonful of butter, heavy cream, or extra olive oil just before serving. Always verify that your broth and canned tomatoes are free from added sugars to keep the soup strictly keto friendly.