Take a piece of parchment paper, about 12 x 15 inches, and fold the long side in half. Form a crease, then open out flat.
Arrange julienne sliced zucchini and green onion in the middle on one side of the crease. Sprinkle vegetables with a bit of salt and pepper, and half of the lemon zest, then drizzle all over with half of the olive oil.
Lay salmon fillet on top of vegetables. Season it with salt, pepper, and the remaining lemon zest and olive oil.
Now fold the parchment over to cover ingredients. Starting at the bottom folded corner, begin folding the edges of the parchment together, making small overlapping folds every 1 to 2 inches. Continue folding all the way around to create a half moon shaped package. Fold the ends again to make sure they are sealed.