01 - Preheat the oven to 200°F. Line two baking sheets with parchment paper.
02 - In a clean, grease-free mixing bowl, combine egg whites and cream of tartar. Beat with an electric mixer on medium speed until soft peaks form.
03 - Gradually add granulated sugar, one tablespoon at a time, while beating on high speed. Continue until the mixture holds stiff, glossy peaks, about 5 to 7 minutes.
04 - Gently beat in salt and vanilla extract until just incorporated.
05 - Fit a piping bag with a large star or round tip. Use a food-safe brush to paint one red, one blue, and one uncolored stripe inside the bag for a tricolor effect.
06 - Carefully spoon the meringue into the piping bag, ensuring you do not disturb the stripes.
07 - Pipe small mounds, approximately 1 to 1.5 inches wide, onto prepared baking sheets, spacing each about 1 inch apart.
08 - Bake for 1 hour and 15 minutes, or until dry and crisp. Turn off oven and leave meringues inside with the door closed for 1 hour to enhance crisp texture.
09 - Gently peel cooled meringues off the parchment and store in an airtight container at room temperature for up to 5 days.