Wash organic lemon hot and dry. Cut the remaining lemons in half and squeeze. Mix lemon juice, honey and olive oil. Season vigorously with salt and pepper.
Preheat oven (electric cooker: 200 °C/circulating air: 180 °C/gas: see manufacturer). Clean the fennel, pluck the greenery and put aside. Wash the fennel and cut into thin slices. Clean and wash spring onions and cut into long pieces. Wash potatoes thoroughly and cut into slices. Mix the fennel, spring onions and potatoes with the lemon marinade, up to 2 tablespoons, and spread on a baking tray. Sprinkle with capers and bake in a hot oven for 35-40 minutes.
In the meantime cut organic lemon into thin slices. Rinse fish, dab dry and cut into 4 equal pieces. Heat the oil in a large pan. Brown the fish on both sides.
About 20 minutes before the end of the baking time, spread lemon slices on the vegetables. Place the salmon on top and spread with the remaining lemon marinade. Fry until done. Then remove from the oven. Sprinkle with fennel greens and sea salt.