Defrost the puff pastry. Wash and peel the asparagus and cut off the woody ends. Bring 1/2 l lightly salted water with sugar to the boil. Add 1 tbsp lemon juice and butter. Cover the asparagus and cook for 15-20 minutes. Drain the asparagus, collect the stock, measure 200 ml
Roll out each slice of dough on a little flour (approx. 15 x 25 cm). Cut out 2 flowers at 1 end each. Roll the asparagus into the dough in portions. Spread with whisked egg yolk and garnish with the flowers. Place on a baking tray lined with baking paper. Bake in a hot oven (electric cooker: 225 °C / convection oven: 200 °C / gas mark 4) for 10-15 minutes
Meanwhile wash the salmon, pat dry and cut into 8 pieces. Fry in hot oil for 7-8 minutes. Season with salt, pepper and a few drops of lemon juice. Keep salmon warm
Sweat mustard in the frying fat. Stir in stock and cream. Bring to the boil, simmer briefly. Thicken sauce, bring to the boil and season to taste. Arrange everything. Garnish with parsley if necessary.