For the crust, knead butter and breadcrumbs into crumbles. Season with salt and pepper. Knead in the almonds. Put the crumbles in a cool place.
Wash the potatoes, peel if necessary and cook for about 20 minutes. Clean, wash and roughly chop the peppers. Peel and chop onion and fry in 1 tbsp. hot oil. Steam the bell peppers briefly. Add 5 tablespoons of water, bring to the boil, cover and simmer for about 10 minutes.
Wash the fish, dab dry and cut in half lengthwise. Season with lemon juice, salt and pepper. Add cream to the peppers and puree. Season to taste and pour into a large flat casserole dish. Put the fish in it and sprinkle with crumbles.
Bake in a hot oven (electric cooker: 200 °C/circulating air: 175 °C/gas: see manufacturer) for about 20 minutes.
Drain the potatoes. Fry in 2 tablespoons of hot oil all around for about 5 minutes. Season. Wash chives, shake dry and cut into fine rolls. Arrange everything and sprinkle with chives.