Wash the asparagus and cut off the woody ends. Cut the asparagus diagonally into strips. Peel and finely chop the onion. Rinse quinoa under hot water. Heat 1 tablespoon of oil in a pot.
Briefly sauté the diced onion and quinoa. Add stock and simmer covered for about 20 minutes. Stir frequently. Wash the plaice fillets and dab dry. Spread 1/2 tsp. pesto on each side and roll up carefully.
Boil up lemon juice, wine, 100 ml water and salt. Put the rolls in. Cover the rolls and let them simmer at low heat for about 8 minutes. Heat 1 tablespoon of oil in a frying pan. Fry the asparagus for about 4 minutes, then add the quinoa.
Season to taste with salt and pepper. Arrange the plaice rolls on the quinoa. Mix 1 tablespoon of pesto with 1-2 tablespoons of fish stock and drizzle over it.