香菇素高汤

食材

• 干香菇 6
• 洋葱（对半切） 2
• 胡萝卜块 2
• 芹菜连叶 1 stalk
• 姜片 3 slices
• 冷水 2 L

做法

1. 1

   Rinse the shiitake quickly, then soak in 500 ml warm water for 20 minutes.

2. 2

   Combine the mushrooms and their strained soaking liquid with all vegetables and ginger.

3. 3

   Top up with cold water to 2 litres and bring to a bare simmer.

4. 4

   Cook uncovered for 45–50 minutes without a rolling boil, skimming once or twice.

5. 5

   Strain and use immediately, or freeze in portions for up to 3 months.