Cook the pasta in salted water for about 8 minutes, then drain. Clean and wash spring onions and cut them into rings. Wash, quarter and seed the tomatoes. Cut the flesh into small cubes.
Beat the lemon juice and 2 tablespoons of oil. Season with salt, pepper and sugar. Mix prepared salad ingredients and marinade. Cover and let stand for about 30 minutes. Season to taste again just before serving.
Wash the chicken filet, dab dry and fry in 1 tablespoon of oil on each side for about 6 minutes until golden brown. Season with salt and pepper. Cut the chicken fillets open and arrange on the salad. Add the pesto.
Serve garnished with fresh herbs and lemon.