Rinse, drain and flake the salmon into a mixing bowl. Chop the onion, tomato and parsley, set aside. Mix all ingredients except tomato and shape the mixture into one or two patties, depending on desired size. Heat oil in a nonstick skillet over medium high heat and cook patties for about 3 to 4 minutes on each side until golden brown. Serve topped with chopped tomato and rice on the side.