To substitute dried mint for fresh, use about one-third as much as the recipe need. For example, if a recipe requires 1 tablespoon of fresh mint leaves, you would replace it with 1 teaspoon of dried mint. Additionally, you can add the dried herb to your dish near the beginning of cooking and allow it to rehydrate in liquid ingredients like sauces or soups. This will ensure that all its flavor is released into your dish.