Preheat the oven to 220°C / 425°F (200°C fan). Lightly grease 2 trays then line with parchment / baking paper.
Place water, butter and salt in a saucepan over medium high heat. Bring to a boil until butter is fully melted.
Remove from stove, add flour, salt, pepper and nutmeg. Mix until incorporated.
Return to stove on LOW heat and mix for 1 minute (this dries the mixture out).
Remove from stove, leave for 2 minutes.
Add 1 egg, mix vigorously until incorporated.
Add 3 more eggs, one at a time, mixing until incorporated before adding the next.
Stir in 2 cups cheese.
Drop 1 tablespoon mounds onto trays.
Brush with yolk, then top with a pinch of reserved cheese for topping.
Bake for 25 minutes.
Allow to cool for 15 minutes so they become crusty and inside dries out a bit.
Serve warm as pre dinner nibbles, finger food at gatherings, or dunk into soups and stews!
