Let me first say that this drink is both strong and can be very spicy, so if you prefer a milder-tasting drink (or a spicier one), you can adjust the spices to your own preference; I also like this recipe a lot because, even cold, it is a great relaxing drink for a night when you would enjoy a warm cup of tea.
6 tbsp kava (powdered or shredded kava both work great, but shredded is what I prefer)
2 cups purified/spring water
1 cup soy or rice milk (chocolate is especially good in this recipe)
a few mint sprigs to taste (I use a large pinch per recipe)
1/2 tsp cinnamon
ginger to taste (optional)
In a blender, pour in the kava, water, soy milk and cinnamon and turn the blender on for just a few seconds to stir the ingredients, then let sit for about 30 minutes. This is the reason I prefer shredded kava: the cinnamon seems to either pull out more kavalactones, or just adds a greater effect to the kavalactones that make them even more relaxing (also note that if using powdered kava, you really only need to let the mixture sit for about 15 minutes).
After these ingredients have steeped long enough, turn the blender on high and leave on for about 3 minutes, then add the mint and ginger if desired. Blend for another minute or two. Then you can either choose to strain the kava into a cup with a muslin bag or leave the kava in and just drink everything to ensure that no kavalactones are missed. This recipe is very strong; if you are not experienced with kava, either use less kava, do not drink all of it at once, or share it with a friend.