A. G. Payne, Cassell's Vegetarian Cookery: A Manual of Cheap and Wholesome Diet
“ Pea Soup, from Split Dried Peas.—Take a pint of split peas and put them in soak overnight in some cold water, and throw away those that float, as this shows that there is a hole in them which would be mildewy. Take two onions, a carrot, a small head of celery, and boil them with the peas in from three pints to two quarts of water till they are tender. This will be from four to five hours. When the peas are old and stale even longer time should be allowed. Then rub the whole through a wire sieve, put the soup back into the saucepan, and stir it while you make it hot or it will burn. ”
