The word "Luo Song" is a transliteration of "Russia" and refers to Russian style. During the October Revolution, a large number of Russians came to Shanghai, bringing not only vodka but also Russian-style western food. And this soup evolved from Russian red vegetable soup.

But Russian red cabbage soup is hot and sour, more sour than sweet. Shanghai people are not used to it. Later, influenced by the purchase of raw materials and local tastes, Luo Songtang with a unique Shanghai style was gradually formed. Nowadays, in Shanghai, almost every family can make Luo Songtang, but the ingredients taste different.

Raw material preparation: red, yellow, white and purple.

Red: beef, tomato sauce and carrots.

Yellow: butter, soybean sprouts and potatoes.

White: milk, flour.

Purple: onion

Second, tomato soup.

The raw materials are generally only eggs and tomatoes.