You can find recipes for pea soup on FoodNetwork.com, MarthaStewart.com and Epicurious.com. There are many different ways to make pea soup and most recipes can be altered according to personal taste.
In general, a recipe for pea soup requires dried split peas and a large amount of stock or water. The Food Network recipe is vegetarian if cooked with water instead of chicken stock, and calls for onions, carrots and potatoes, as well as various spices. The Epicurious recipe uses celery, carrots and smoked pork hocks for extra flavor and texture. Martha Stewart's recipe also includes meat, in the form of cubed glazed ham.