6 tablespoons/86g butter
1 teaspoon/5ml salt
1/8 teaspoon/.5ml pepper
¾ cup/94g flour
1 to 1½ cup/111-167g grated Gruyère cheese (Gruyère is a cream-colored Swiss-type cheese, but you can use any semi-hard cheese you like)
1 egg + 1 teaspoon/15ml water for egg wash
optional: additional grated cheese or chopped fresh herbs for topping
In a heavy saucepan, bring water to a boil with butter, salt, pepper and nutmeg and boil until the butter has just melted.
Stir in the cheese. (The cheese may or may not fully “melt” into the dough.)
Bake for 20-25 minutes, until puffed and golden.