Beef and pork meatballs with quinoa and caramelized onion

For this recipe, the following elaborations are necessary:

• Pig and beef meatballs 
• Tomato sauce
• For the meatballs sauce: 
  • Prepare a white stock using the meat extract.
  • Cut the vegetables: laminate the garlic, shred the onions and cut the carrot and leek into half moons. 
  • Poach according to hardness order. Degrease, add the red wine and allow to reduce. 
  • Thicken it with 35 g of flour per litre of stock.
  • Add  the stock and the tomato sauce to  enforce and give colour to the elaboration.
  • Blend with a food processor and put the mixture through a colander.  
  • Boil it again, and adjust the salt and thickness.