Pre-heat oven to 425 (220 C/ Gas 7.
Place butter and sausages in a 10 x 12 roasting pan.
Cook for 10 minutes, or until they are done to your liking.
Sift the flour into a bowl.
Break in the egg.
Gradually add half the milk, beating to form a smooth batter.
Pour in the remaining milk and beat until quite smooth.
Alternatively, add the flour, milk and egg to a blender or food processor and blend until smooth.
Pour the batter into the roasting pan and bake for 40-45 minutes, until the batter is well risen and golden.