Heat 2 tablespoons of oil in a frying pan. Sprinkle in ½ tablespoon of wine and pour in 6 cups of soup stock immediately. Then add the sweet corn and mix well. Cook until the soup boils.
Season with 2 teaspoons of salt. Then add mushrooms, tomatoes and fava beans. When it boils again, reduce the heat to low and pour in the cornstarch paste slowly. Stir well unt