Peel and finely dice the onions and garlic. Heat the lobster paste in a pot, fry 1 onion in it. Add cream, 100 ml water and white wine while stirring, simmer for about 5 minutes at low heat.
Season to taste with salt and pepper. Wash the dill, shake dry and chop the flags.
Clean, wash and drain the spinach. Heat the oil in a pot. Sauté 2 onions and garlic in it. Add the spinach and let it collapse. Season with salt, pepper and nutmeg. Keep warm.
Wash the plaice thoroughly and dab dry. Mix flour, 1 teaspoon salt and pepper. Turn the plaice in flour. Heat 1 tbsp. clarified butter in 2 frying pans, fry the plaice in portions on each side at medium heat for approx. 4 minutes.
Stir the dill into the sauce. Wash lemon with hot water, grate dry and cut into slices. Arrange spinach, plaice and sauce on a plate. Serve with baguette.