The most nourishing soup

A pot of Rumford’s Soup from the basic recipe: pearl barley and dried peas, water, salt, some vinegar (no potatoes). Thanks to Gestumblindi.

Found - an 'extract' from a book about food with a recipe for pearl barley soup. This piece appears in various forms throughout the 19th century but derives from work with the poor by Benjamin Thompson (Count Rumford)  when he was army minister in Bavaria in the 1790s. Rumford was an American ennobled by the courts of Europe because of his pioneer discoveries in cooking.The soup is sometimes known as Rumford's Soup. He wrote:

The difference in the apparent goodness, or the palatableness, and apparent nutritiousness of the same kinds of food, when prepared or cooked in different ways struck me very forcibly and I constantly found that the richness or quality of a soup depended more upon a proper
choice of the ingredients and a proper management of the fire in the combination of those ingredients, than upon the quantity of solid nutritious matter employed ;— much more upon the art and skill of the cook, than upon the amount of the sums laid out in the market.

I found, likewise, that the nutritiousness of a soup, or its power of satisfying hunger, and affording nourishment, appeared always to be in proportion to its apparent richness or palatableness. But what surprised me not a little, was a discovery of the very small quantity of solid food, which, when properly prepared, will suffice to satisfy hunger, and support life and health ; and the very trifling expense at which the stoutest and most laborious man may, in any country, be fed.

After an experience of more than five years in feeding the poor