Ingredients for 4 servings

half-salted caramel cream and white mustard
  • 2 kg of leek whites (just a little green)
  • 120 g of fine butter
  • 4 sugar cubes
  • 15 cl of liquid cream (30%)
  • 1 generous tablespoon of strong mustard
  • salt, freshly ground pepper, a few grains of fleur de sel, nutmeg zest