Preheat oven to 350 degrees. Put a generous half-teaspoonful of cooking oil in the bottom of each cup of a deep 12-hole muffin pan set on a baking tray.

Pour the milk into a bowl, add the egg, flour and a pinch of salt and whisk everything together with a hand blender or wire whisk until a smooth batter forms.

Put the muffin pan in the oven for a minute or so until the oil is very hot. Carefully remove from the oven and quickly fill the cups just under two-thirds full (this may not seem enough batter, but they puff up in the oven). Drop 2 sausages into each cup and bake for 20-25 minutes until golden brown, well risen and crisp.