1 Cut off lower asparagus tips. Place asparagus in the bouillon in frying pan with a tight-fitting lid. Steam gently on a low heat for 10-15 minutes with the lid on.
2 Cook lasagne sheets al dente in salty water. Sieve and set out on kitchen paper.
3 Roughly chop the parsley and set some aside for the relish. Finely grate the Gruyère AOP. Mix half of the cheese with parsley and ricotta. Season with salt and pepper.
4 Line the lasagne sheets with salmon slices and coat with the cheese mixture. Spread the asparagus on top and roll up with the lasagne sheets. Place in a baking tray.
5 Dice the tomatoes. Sprinkle the rest of the cheese over the asparagus rolls. Add the bouillon. Bake in the oven at 200 degrees for approximately 20 minutes. Sprinkle with parsley.