Season duck breast with salt, season with pepper and fry heartily without fat on the skin side, turn to the other side and continue to fry for 2 min. Continue to cook in an ovenproof dish in a 200 °C (gas 3, convection oven 180 °C ) oven for 10 min.
Cut the spring onions into 3 cm long pieces, peppers into strips, drain the pineapple. Stir the juice with soy sauce, clear soup and maizena (corn starch). Roast onions and peppers in the frying fat for 3 min. Add pineapple and juice mixture, make 2 min, season with salt, pepper and cayenne pepper.
Cut the duck breast into slices and serve. Sprinkle with sesame seeds and cilantro greens.