Position racks in the upper and lower thirds of your oven, then preheat to 200°F. Line two baking sheets with parchment paper—this low temperature is critical because it dries the meringue rather than browning it, which keeps your kisses pristine white. High heat browns meringues too quickly on the outside while leaving centers gooey, a mistake I made repeatedly before understanding that patience creates elegance.
Crack eggs into a completely grease-free bowl (even microscopic oil sabotages meringue whipping). Immediately add cream of tartar, then beat with an electric mixer on medium-high speed for about 3 minutes until soft peaks form. You'll see the mixture transform from clear liquid into billowing clouds—this is the moment you feel like a magician, honestly.
Gradually add granulated sugar one tablespoon at a time while continuing to beat, which takes roughly 5 minutes total. This slow integration builds stable foam because sugar dissolves incrementally rather than creating clumps. Once all sugar incorporates, add vanilla extract and beat for another 30 seconds. You've now created stiff peaks that hold their shape when you lift the beater away.
Fold in powdered sugar, lemon zest, and kosher salt using a rubber spatula with 8-10 deliberate strokes—overmixing deflates your work. Transfer the meringue to a piping bag fitted with a large round tip, then pipe 1-inch kisses onto your prepared baking sheets, spacing them 1 inch apart. I learned that piping height matters; holding the bag about an inch above the sheet creates uniform heights that bake evenly.
Bake for exactly 50 minutes on both racks (swap sheet positions halfway through for even browning). The meringues should feel firm on the outside but slightly yield when pressed gently. Remove from the oven and let cool completely on the baking sheets—rushing this step and removing warm meringues causes them to crack and collapse.
Once completely cool, melt white chocolate in a microwave-safe bowl in 20-second intervals, stirring between pulses. Working quickly, dip each meringue kiss's pointed top into the chocolate, then immediately press it into a mixture of red sanding sugar, blue sanding sugar, or edible dragees. This chocolate layer acts as adhesive that keeps decorations permanently attached rather than sliding off during serving.
Place decorated kisses on a clean parchment sheet and let the chocolate set for 15 minutes at room temperature. These now transition into actual elegant 4th of july meringue kisses elegant treats worthy of your finest serving platter.