Dry the scallops on kitchen paper and season. Heat a heavy-based pan, then add the oil. Once hot, add the scallops, keeping them close together – this helps the sides to stay straight and tall rather than sagging. Sizzle for 2 mins until caramelised and you can see the heat creeping up the outside. Turn over with a palette knife, then fry for 1 min more. Take off the heat, then add a few good slices of the butter to the pan, spooning over the scallops as it melts.
