Clean, rinse and drain the leaf lettuce.
Clean the fresh mushrooms, finely slice and drizzle with the juice of one lemon.
Cut the shallots.
Stir the balsamic with pepper, salt, tarragon, shallot cubes and safflower oil.
Toss lettuce leaves and mushrooms through the marinade and arrange on plates.
Place two slices of salmon on each plate and sprinkle with parsley.