01 - Preheat oven to 200°F. Line two baking sheets with parchment paper.
02 - In a perfectly clean mixing bowl, combine egg whites and cream of tartar. Beat with an electric mixer on medium speed until soft peaks form.
03 - Add granulated sugar one tablespoon at a time, beating on high speed after each addition. Continue until meringue forms stiff and glossy peaks, about five to seven minutes.
04 - Beat in salt and vanilla extract just until combined.
05 - Fit a piping bag with a large star or round tip. Using a food-safe brush, paint one red stripe, one blue stripe, and leave one section plain inside the bag to create the swirled effect.
06 - Carefully spoon the meringue mixture into the prepared piping bag, keeping color stripes intact. Pipe 1 to 1.5 inch wide kiss-shaped mounds onto the lined sheets, leaving one inch between each.
07 - Bake for 1 hour 15 minutes, or until meringues are dry and crisp. Turn oven off and allow meringues to cool completely inside, with the door closed, for one hour.
08 - Gently peel meringues from parchment and transfer to an airtight container. Store at room temperature for up to five days.