In a large nonstick skillet, heat 3 tablespoons of oil over medium heat. Add the onion and cook, stirring frequently until golden brown. Remove from pan.
Add remaining oil to pan and add the potatoes. Cook, turning occasionally, until evenly browned. Add the onions back to the pan, plus the salmon, zucchini, lemon and orange zests, salt, paprika, pepper and scallions. Stir gently to combine the ingredients and cover with a lid for 3 to 5 minutes, or until the salmon is heated through.
To serve, sprinkle with parsley.
A viewer or guest of the show, who may not be a professional cook, provided this recipe. It has not been tested for home use.