Instructions

1. Cutting against the grain, chop the beef into ½” pieces.
2. To a large saucepan over medium heat, add avocado oil, chopped onion, and minced garlic. Sauté until onion and garlic are fragrant, about 3 minutes. Add chopped beef, thyme, salt, and pepper and sauté until beef is cooked throughout, about 8 minutes, stirring frequently to brown each side of beef.
3. Decrease stovetop heat to medium-low and pour in beef broth and vinegar into a saucepan. Simmer mixture uncovered for 30 minutes.
4. Stir in mushrooms, cover the pan with lid, and simmer for additional 1 hour, 30 minutes.
5. Remove pan from heat and stir in sour cream and mayonnaise until thoroughly incorporated. In ¼ tsp increments, stir in xanthan gum until liquid thickens. Return lid to the pan and allow the pan to sit covered for 10 minutes before serving in bowls.