01 - Preheat oven to 200°F. Line two baking sheets with parchment paper.
02 - In a grease-free mixing bowl, combine egg whites and cream of tartar. Beat on medium speed with an electric mixer until soft peaks form.
03 - Gradually add granulated sugar, one tablespoon at a time, beating on high speed until the meringue forms stiff, glossy peaks, about 5 to 7 minutes.
04 - Beat in salt and vanilla extract just until incorporated.
05 - Fit a piping bag with a large star or round tip. Using a food-safe brush, paint three stripes inside the bag: one with red gel food coloring, one with blue, and one plain for white.
06 - Carefully spoon the meringue mixture into the piping bag, trying not to disturb the colored stripes.
07 - Pipe small kiss-shaped mounds, approximately 1 to 1.5 inches wide, onto the prepared sheets, spacing about 1 inch apart.
08 - Bake for 1 hour and 15 minutes or until meringues are dry and crisp.
09 - Turn off the oven and allow meringues to cool inside with the door closed for 1 hour to ensure extra crispness.
10 - Gently peel meringues off the parchment and store in an airtight container at room temperature for up to five days.