Ingredients

• 250 ml milk
• 1 egg yolk
• 20 g coarse flour
• 10 g cornstarch
• 40 g butter
• 1 teaspoon mustard

• salt
• vinegar
• a little sugar
• a pinch of ground pepper

Cooking guidelines

Pour water into a medium saucepan and bring it to a boil.

Pour the milk into a smaller saucepan and whisk in the egg yolk, flour, starch meal, salt, vinegar, softened butter, mustard, sugar and pepper.

Place the saucepan in a saucepan of boiling water and cook the mixture, stirring constantly, until it reaches a simmer.

Once the mayonnaise has thickened, turn off the stove, stir for a few more minutes and serve.