First Step: Preheat your oven to 350°F (175°C). Prepare cupcake pans by lightly greasing or using parchment liners to ensure easy release. Separate egg whites carefully, ensuring no yolk contaminates.

Second Step: Using a clean, dry bowl, whip the egg whites with cream of tartar and salt on medium speed until soft peaks form.

Third Step: Gradually add granulated sugar in small portions while continuing to whip until stiff, glossy peaks are achieved.

Fourth Step: Gently fold in sifted cake flour in batches, taking care to maintain the airy texture.

Fifth Step: Blend in lemon zest and fresh lemon juice carefully for even distribution of flavor.

Sixth Step: Spoon the batter evenly into prepared cupcake liners, filling about two-thirds full.

Seventh Step: Bake for 18-20 minutes or until a toothpick inserted comes out clean. Avoid opening the oven early to prevent collapsing.

Eighth Step: Remove from the oven and allow cupcakes to cool upside down in the pan to preserve volume and lightness.

Final Step: Once cooled, garnish with a light dusting of powdered sugar or a lemon glaze. Serve fresh or store as preferred. For dietary adaptations, substitute ingredients as noted in the ingredients section at each step.

To make the frosting, chill the mixer bowl and beaters for 30 minutes in the freezer or fridge. Then, pour 2 cups heavy whipping cream, 1/2 cup powdered sugar, 1 tablespoon clear gelatin, and 1 tablespoon vanilla into the bowl. Whip on medium-high speed for about 2 minutes until thick and fluffy, stir in 2 teaspoons lemon zest and half of the 4 tablespoons lemon juice, then taste and add more if desired. Pipe the frosting onto the cupcakes and optionally sprinkle with candy sugar crystals or nonpareils.