1. To begin, take a saucepan, add 4 cups of water and let it come to a boil.

2. Once the water starts boiling, add the fresh mint leaves and let it simmer on low heat for about 15 minutes. This will allow the mint flavor to infuse into the water.

3. After 15 minutes, turn off the heat. Using a strainer, strain the mint-infused water into a blender, removing the mint leaves.

4. To the mint water in the blender, add 1 cup of sugar and 1/2 cup of fresh lemon juice. Blend until sugar is completely dissolved.

5. Pour your prepared Gillywater Delight into a jar or pitcher. Sprinkle the tablespoon of edible silver glitter into the beverage and stir until evenly dispersed.

6. Chill in the refrigerator for about 2 hours before serving.

7. Serve your Gillywater Delight cold in individual glasses, offering your guests a magical potion from the wizarding world of Harry Potter.