Preheat the oven to 200℃
First, make the batter. Add the flour into a large mixing bowl and make a 'well' in the middle. Add the eggs and whisk until well combined.
Now add the milk bit by bit, whisking in between until you have a smooth batter that coats the back of a spoon.
Pour the batter into a jug and place it into the fridge.
Put the sausages into a suitable oven dish, add the sunflower oil and bake for 20-25 minutes until they are lightly browned. Turn the sausages half way through cooking.
Take out the sausages from the oven, the fat should be sizzling hot so be careful. As soon as you take them out, pour the batter into the dish all around the sausages until they are half submerged.
As soon as the batter is in there, get the sausages back into the oven onto the top shelf and close the oven door.
Cook for 25-30 minutes, until it is well risen and golden. Do not open the oven door until you are confident it has cooked.
Serve with gravy.