Preheat oven (electric cooker: 125 °C/circulating air: 100 °C/gas: not suitable). Wash the dill. Wash fish, pat dry. Season with sea salt and pepper. Wrap in foil with the dill. Cook in the oven for about 20 minutes.
Wash the purslane and cut into strips. Mix with mayonnaise, sour cream and 1 tablespoon of oil. Season to taste with salt, pepper and lemon juice.
Let the fish cool down. Pluck into pieces and remove any remaining bones. Fold into the herb mayonnaise.
Increase oven temperature (electric cooker: 175 °C/circulating air: 150 °C/gas: level 2). Line two to three trays with baking paper. Cut baguette into thin slices and spread them on the trays. Sprinkle with 2 tablespoons of oil and season with sea salt.
Roast in a hot oven for about 10 minutes, turning once.
Clean or peel the vegetables. Cut the ends off the asparagus. Cook the asparagus in boiling salted water for 2-3 minutes. Drain. Cut cucumber lengthwise in half and remove seeds. Cut cucumber, carrots and peppers into long thick strips.