Whisk together the milk, flour, eggs and salt in a medium bowl until well mixed. Let the batter sit at room temperature for 30 minutes.

Preheat oven to 350F/180C. Butter a 9-inch/23 cm pie dish.

Scatter the sausages over the bottom of the prepared dish. Place the dish in the oven for about 10-15 minted to render some fat from the sausage.

Remove dish from the oven and pour the batter over the sausage. Return to the oven.

Bake for 45 minutes until sausage is cooked through and batter has puffed up and browned.