Place the margarine in a 3-quart kettle, and melt over medium heat. Add the onions and spelt flakes, and cook, stirring constantly, until the flakes have browned.
Add the carrots, zucchini, and water to the pot. Increase the heat to high, and bring to a boil. Reduce the heat to low, and add the salt, pepper, bouillon cubes, and nutmeg. Cook uncovered for 30 minutes.
Transfer the soup to 6 soup bowls. Sprinkle each serving with a little parsley, and serve immediately.