Soften the onions in a little oil, stirring consistently, then add the pork. When the pork is cooked through, mix in the curry powder. Cook for a couple of minutes. Bring a large pot of water to a boil and cook the noodles at a lower simmer. Add 7 cups of the water to the pork mix, stir it in, add soy sauce, then add the last cup of water–thickened with cornstarch (just lightly thickened). Finally, add the cooked noodles to the thickened broth and sprinkle in the slices of the green onion. Serve in bowls.