Clean piece of pumpkin, removing the peel and remove the seeds and fibers. Rub the flesh on a coarse grater and squeeze through the fabric. Make sure that no bones salmon fillet and chop it finely. On a large sheet of parchment paper Put the pumpkin pulp, squeeze a few drops of lemon juice, add the salmon and gently fold the paper, wrapped it around the edges. Put the envelope in a steamer and cook for 15-20 minutes in low mode. Chop the pumpkin and salmon with a fork, add the canola oil and the chopped chervil.