Mushroom soup Ingredients › 1 tsp of vegetable oil › 10 mushrooms, chopped › 1 onion, finely chopped › 1 low-salt stock cube dissolved in 575 ml of boiling water › 425 ml of low-fat milk › pinch of salt if desired › pepper Method 1. Heat the oil in a saucepan. Add the mushrooms and onion and fry, stirring continually for 5 minutes. 2. Gradually stir in the stock and milk and bring to the boil. Keep stirring. 3. Simmer for 20 minutes. 4. Add salt and pepper to taste