Rivel soup appears to be a German-Menonite creation. Wikipedia, amazingly enough, did not have a definition for me, and their question software is too annoying to penetrate. However, there are many recipes for it on the internet, and the ones I looked at made mention of a German or Memonite origin. Rivels would be noodles if they had a shape. They are little bits of flour egg dough dropped into the soup. This is a tasty, easy soup to make, except the rivels need more than one egg yolk to be made into anything. Try two egg yolks, and then you may still need a little water.
1 cup flour
1/4 teaspoon salt
1 egg yolk
8 cups boiling chicken broth
1 cup corn kernels (freshly cut from cob, it says. If not that time of year, use frozen)
Salt and freshly ground black pepper to taste
1. Place the flour and salt in a bowl. Add the egg yolk and with the fingers work together until mixture is crumbly.
2. Add the crumbs, a few at a time, to the boiling broth. Add the corn, salt and pepper and boil ten servings. Makes six servings.