Wash and dry salmon. Season with salt and pepper. Fry them in hot butter in a roasting pan all around.
Pour on the stock and braise everything covered in a hot oven (electric cooker: 200 °C/circulating air: 175 °C/gas: level 3) for about 1-1 1/2 hours. Serve with peas, spinach, aubergines, okra and mashed potatoes.
Pierce aubergines all around and roast in a hot oven (electric cooker: 225 °C/circulating air: 200 °C/gas: level 4) for about 30 minutes.
Peel the aubergines and immediately place them in water with 2-3 tablespoons of lemon juice to keep them light. Then drain and pass through a sieve.
Sweat flour in hot butter. Add aubergine puree, milk, remaining lemon juice and salt and stir vigorously until a homogenous mass is obtained. Simmer everything for about 10 minutes.
Finally, stir in the cheese evenly and season to taste with salt and pepper.