Place oxtails, onion, stock and seasonings in Instant Pot. Place lid and set pressure cooker to high for 50 minutes.
Allow pressure cooker to naturally relsease for 15 min then carefully move vent to quick release.
Remove oxtails from pot and pull meat from the bone and shred.
Remove fat pieces from the pot and skim fat from the surface.
Add meat back into the pot.
For the Meatballs
Combine all ingredients in a large bowl.
Form small, one inch meatballs.
Add meatballs into pot.
Set Instant Pot to medium Saute. Cook until meatballs float to surface.
For the Soup
Add chopped greens and cauliflower rice to pot. Cook for 10 min.
Beat egg then mix in parm cheese.
Slowly whisk egg mixture into soup.
Serve with final sprinkling of parm cheese.
Notes
Macros: Number of servings: 4 Amount per serving: Calories 683 Total Fat 39g Carbohydrate 5g Dietary Fiber 4g Net Carbs 1g Sugars 1g Protein 75g Potassium 278g Vitamin A 20% Vitamin C 16% Calcium 47% Iron 38%