For the white wine sauce:
- In a small casserole, mix wine, shallot, sugar, pepper and salt. Bring to a boil and boil for 5 minutes or until the mixture reduces to 180 ml (3/4 tasse). With a sieve set above a heat-proof bowl, sieve white wine preparation. Cool down.
- With a whisk, add egg yolks to the white wine preparation. Set over a casserole filled with boiling water, then cook and whisk for 5 minutes or until the mixture is pale and thick. Remove from heat. With the whisk, add butter.
For the ham, asparaguse and ricotta garnishing:
- Mix Ricotta cheese, 160 ml (2/3 cup) of Gruyère, cream and chopped chive. Salt and pepper. Over the paler side of each crepe, lay 2 or 3 ham slices and 2 or 3 asparagus. Cover with 45 ml (3 tablespoons) of Ricotta mixture and with 15 ml (1 tablespoon) of sauce. Fold crepes over garnishing.
- Set stuffed crepes side by side on a buttered oven safe plate of 13 inches x 9 inches (33 cm x 23 cm), or into individual gratin plates. Coat crepes with remaining of the sauce. Oven bake at 350 °F (180 °C) for 10 minutes. Spread with remainings of Gruyère cheese and broil under preheated grill for 1 to 2 minutes or until sauce is lightly gratin. When serving, garnish with a bit of chive.