How to Thicken Soup. Nothing is more welcome on a chilly day than hot bowl of soup, especially a thick stew. If your soup turns out too thin and watery for your taste, don't despair. There are several ways to thicken it up, using common household ingredients.
Using Potatoes to Thicken Soup
Set the soup on medium low heat.
Peel and wash a medium sized potato.
Coarsely grate the potato with cheese grater or food processor.
Stir the potato into the soup and let it simmer until it reaches the desired thickness.
Using Beans to Thicken Soup
Open a can of white cannelloni beans. If you don't have cannelloni, use another mild flavored canned bean. Avoid using kidney beans.
Drain and rinse the beans.
Blend the beans with one cup of the soup broth in a blender or food processor, until the beans are pureed.
Add the bean puree back to the soup pot and let simmer on low to medium heat until thickened.
Using Flour or Cornstarch to Thicken Soup
Put two tablespoons of flour or cornstarch into a small mixing bowl.
Add just enough warm water to dissolve the flour or cornstarch. Use a fork or small whisk to mix the flour or cornstarch with the water until you have a runny paste.
Pour a cup of warm water into the bowl and mix.
Incorporate the flour/cornstarch water into the soup and let simmer on low to medium heat until thickened. If the soup doesn't thicken up enough, simply repeat steps until the soup is thick enough.