Keto Beef Stroganoff

Ingredients

• ¼ cup 56g avocado oil
• 50 g white onion (finely chopped)
• 2 tsp 10g minced garlic
• 3 lbs fat-trimmed beef brisket
• 2 tsp ground thyme
• ¾ tsp salt
• ½ tsp black pepper
• 1 ½ cups 367g beef broth
• 2 tbsp 30 mL apple cider vinegar
• 16 oz fresh mushrooms (sliced)
• ¾ cup 180g sour cream
• ¼ cup 60g mayonnaise
• 1 ½ tsp xanthan gum