Oak bark cut - 40 g

Preparation: Always prepare by boiling. Bring 3 dl of water to a boil, then, once it is gently bubbling, add one teaspoon of oak bark. (If it is not crushed, grind or grate it, or cut it into small pieces.) Boil for 3–4 minutes, then remove from the heat and leave to steep for at least another 5–10 minutes before straining. You can drink 2 cups a day, taking small sips. It is more effective if you add silverweed, walnut leaves, and sorrel. Use one level teaspoon of each per cup.