Preheat oven to 200oC and place an ovenproof dish with 2 tbsp vegetable oil in the oven to heat.
Make the batter. Whisk together flour and mustard powder with a small amount of milk, and gradually add the milk and eggs until a smooth batter is formed. Season and set aside.
Wrap the sausages in a rasher of bacon and fry until golden brown.
At the same time, fry the onions over a medium heat for 4-5 minutes until they begin to caramelise.
Remove the heated ovenproof dish from the oven and place the sausages in the base, and pour over the batter.
Place in the oven to cook for 35-40 minutes.
Then return to the onions, which should now be caramelising slightly, pour over home made stock and add a bay leaf and one whole clove of garlic.
Allow the gravy to gently simmer. Adding a small amount of red wine to taste. Simmer for 15 minutes.