Drain the soaked lotus seeds and place them in a saucepan with 4 cups of water. Bring to a boil and simmer for about 10 minutes until tender.

Transfer the cooked lotus seeds to a blender. Add honey, vanilla extract, and lemon juice. Blend until smooth, adding water as needed to reach desired consistency.

Strain the blended mixture through a fine mesh strainer into a bowl to remove any solids. Pour the drink into serving glasses and garnish with chopped mint and whole lotus seeds.