Pre-heat your oven to 90 C / 200 F.
Add the aquafaba and cream of tartar to a clean bowl.
Using an electric whisk beat on high until you have "soft peaks". This should take roughly 5 minutes.
Slowly add in the sugar, a tablespoon at a time, and continue to beat until all the sugar is added. At this point it should have formed stiff peaks.
Add the vanilla and beat until just combined.
Fill your piping bag with a nozzle of your choice. I like to use a round or star nozzle.
Dab a little meringue in the corners of your baking trays then cover the trays with baking paper.
Pipe roughly 18 kisses on each tray leaving gaps in between as they will puff slightly in the oven.
Place into the oven and cook for 90 minutes. You will know they are completely cooked when they peel off of the baking paper easily.
Turn off the oven and leave it to cool with the meringues inside.