Atmospheric pollution caused by burning cheap soft coal created the city's notorious pea soup fog. In 2012 it was noted that the restaurant sold of pea soup in a day. These dumplings are a traditional part of Puerto Rican-style pigeon pea soup. Through time travel, he succeeds by switching the Lao Mang Long Soup with pea soup. Pea soup is a common dish throughout Germany. London had long been noted for its pea soup fog. By March the lake is "as green as pea soup" with photosynthesizing algae. Meatballs, pea soup and rye bread are examples of such staples. It is therefore referred to as (pea soup with floating ice). While the restaurants are best known for their pea soup, they serve complete home-style meals. Outside Francophone areas, pea soup is sometimes served with johnny cake. In North America, a similarly traditional dish is split pea soup. The Swedish Armed Forces also serve their conscripts pea soup and pancakes every Thursday. In the United States, "pea soup" without qualification usually means a perfectly smooth puree.