Preheat oven (electric cooker: 100 °C/circulating air: 75 °C/gas: see manufacturer). Wash the meat, pat dry and cut the skin crosswise. Place in a cold ovenproof pan with the skin side down.
Fry over medium heat for 6-8 minutes. Spread with 1 tbsp. hoisin sauce. Turn the duck breast and roast on the meat side for 2-3 minutes. Bake in a hot oven for 20-25 minutes.
Meanwhile melt butter and let it cool down a little. Clean and wash the spring onions, first cut them into pieces (each approx. 8 cm long) and then cut them lengthwise into fine strips. If necessary, wash the chives and dab dry.
Remove the duck breast and put it aside covered. Turn up the oven temperature (electric cooker: 200 °C/circulating air: 175 °C/gas: see manufacturer). Line a baking tray with baking paper, brush with oil and place in the hot oven.
Beat the eggs. Season with 1⁄4 TL salt. Embezzle butter. Pour egg mixture evenly onto a hot baking tray and bake in the oven for 8-10 minutes.
Take it out. Cut out approx. 15 circles with a cookie cutter (approx. 8 cm Ø) (use the rest for other purposes). Cut the duck breast into about 15 slices. Spread omelettes with 3 tbsp. hoisin sauce.
Spread the meat and spring onions over it. Fold up the sides, tie them together with chives if necessary.