CHEESE SOUP Light-coloured and dry cheese is necessary for this somewhat peculiar soup, but the best cheese of all is, undoubtedly Gruyere. Grate half a pound of cheese and spread a layer of this at the bottom of the soup-tureen. Cover this layer of cheese with some very thin slices of stale crumb of bread. Then put another layer of cheese and another layer of bread till all the cheese is used up. Next take about two tablespoonfuls of brown roux