Clean the eel, cut a knife on both sides of the fish every three centimeters or so, then put a little salt and marinate for fifteen minutes. Wash the salt on the eel, put the fish on a plate and fix the fish with a toothpick; Put onions and ginger slices on the fish. Boil water in a steamer, put the fish dish in after the water boils, steam for 10 minutes, turn off the fire, and then stuffy for 5 minutes, then take out the fish, remove the onions, ginger and toothpicks that fix the fish, and then pour the steamed fish with soy sauce, and the delicious steamed seven-star eel is ready.