Ingredients for 4 servings

servings
  • 40 g (1.4 oz) farmhouse butter
  • 40 g (1.4 oz) type 55 flour
  • 40 cl (1.7 cups) whole milk
  • 110 g (3.9 oz) real farmhouse Gruyère cheese, freshly grated
  • 4 organic eggs (4 yolks and 4 whites)
  • fine salt, a pinch of Cayenne pepper or Espelette powder
  • a grating of nutmeg