Cook the potatoes in boiling salted water until tender, drain and mash with the milk and Lee Kum Kee (Professional) Chilli Garlic Paste . Keep warm.
While the potatoes are cooking begin to make the onion gravy, and put the sausages under a grill to cook.
Heat the oil in a large frying pan, add the onions and cook over a medium heat for 10-12 minutes until golden. Stir in the flour then gradually add the stock, Lee Kum Kee (Professional) Gluten Free Oyster Sauce and balsamic vinegar. Simmer 2-3 minutes.
Remember to turn the sausages whilst cooking. Serve with the mashed potatoes (with butter on top if preferred) and the red onion gravy.