HEAT oil in a skillet over low heat; add garlic and onion. Cook until soft. Set aside.
COOK pasta according to package directions; drain well. Put pasta back in the pot it was cooked in. Add garlic and onion mixture; mix well. Add lemon juice, green onions, parsley and salmon; mix well again.
SEASON with salt and pepper to taste. Garnish with Italian parsley and lemon slices, if desired.