Wash the potatoes and cook in boiling salted water for about 20 minutes. Meanwhile wash leek and cut into rings. Cut carrots into thin slices. Chop onion finely. Wash parsley, dab dry and pluck leaves from the stalks.
Wash the plaice fillets, dab dry and season with salt and pepper. Spread with pesto and cover with parsley, except for a little to garnish. Roll them up and fix them with wooden skewers. Heat the oil in a pot and sauté the onion in it. Add carrots, season with salt, pepper and sweetener, steam briefly and add 100 ml water. Add leek. Place the plaice rolls on the vegetables and cook covered for about 10 minutes. In the meantime, drain the potatoes, steam briefly and mash them. Warm up the milk and stir in. Season to taste with salt and nutmeg.
Add leek. Place the plaice rolls on the vegetables and cook covered for about 10 minutes. In the meantime, drain the potatoes, steam briefly and mash them. Warm up the milk and stir in. Season to taste with salt and nutmeg. Arrange 2 plaice rolls each with leek vegetables and mashed potatoes on plates. Garnish with the rest of the parsley