Rinse the black beans thoroughly and let them dry. Pour the beans into a skillet and toast over medium heat, stirring constantly so they don’t burn. Burnt beans will give the drink a bitter taste.

When the beans become fragrant, remove from heat and let them cool completely. Store in an airtight container for later use. To make the tea, measure 1 cup of toasted black beans and combine with 6 1/3 cups cold water (about 1.5 liters). Bring to a boil and simmer for a few minutes until the liquid becomes rich and flavorful. Pour into a glass or bottle and refrigerate to enjoy throughout the day.