Put the flour and salt in a bowl and make a well in the centre.
Add the eggs and whisk, gradually drawing in the flour.
Slowly pour in the milk while whisking to form a smooth, thin batter (about single-cream consistency).
Stir in the melted butter.
Let the batter rest 15–30 minutes (important for tender crêpes).
Heat a lightly buttered non-stick pan over medium heat.
Pour in just enough batter to coat the base thinly, swirling immediately.
Cook about 1 minute until lightly golden underneath.
Flip and cook another 30–40 seconds.
Stack on a plate and keep warm.
Serve with lemon juice and sugar, jam, chocolate spread, or savoury fillings.