Place the mixed vegetables and half the Walnuts in a food processor and pulse to give a coarse paste. Remove the skins from the sausages and mix the meat into the vegetable paste, season. Divid into 20 small balls.
Heat the oil in a large frying pan and fry the meatballs in 2 batches for 5 minutes each until golden, remove and set aside. Add the tomatoes to the pan and fry for 2 minutes, add the grains, remaining Walnuts and spinach and stir until just the spinach has just wilted. Return the meatballs back to the pan, cover and heat through for 2-3 minutes.
Meanwhile, mix the yogurt and mustard together and serve with the stir fry.
Notes
Cooks tip Try flavoured sausages instead of the pork ones. Any pouch of grain will work such as quinoa or replace with a pouch of mixed rice.Salt = 1.5g per serving