Wash duck breasts, pat dry and cut the skin in small lozenges. Season with salt and pepper. Sauté duck breasts on the skin side, then turn and fry for another 2-3 minutes.
Place the duck breast on the fat pan of the oven and bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for approx. 20 minutes. Clean and wash the Brussels sprouts and cook in boiling salted water for about 15 minutes.
Cook the lasagne plates in plenty of boiling salted water for 10-12 minutes. Remove the duck breast, wrap in aluminium foil and let it rest. Dissolve the roast with the duck stock and pour into a pot. Add port wine and bring to the boil.
Stir starch with a little cold water until smooth. Thicken the sauce with it, bring to the boil briefly. Season to taste with salt and pepper. Roast the almonds in a pan without fat, take them out. Sliced duck breasts
Arrange on plates with lasagne leaves, Brussels sprouts and some sauce. Sprinkle with almond flakes. Garnish with thyme if desired.