Mix the milk, sugar in a bowl and slowly add the flour. Use a whisk to obtain a batter of medium density, with no lumps.
Finally, add the egg and 3moretti orange zest.
Place the batter in the refrigerator to set for 10 minutes.
In a non-stick pan, add a pinch of butter and pour in a ladle of batter, starting at the sides and ending in the middle of the pan.
When the crêpes are cooked on both sides, fill with 3moretti orange marmalade and sprinkle with icing sugar to taste.