Put 2 tablespoons plus 1 teaspoon filtered water in a small glass bowl. Sprinkle the gelatin evenly over the surface and leave it to bloom until pale, translucent, wrinkled, and softly set.
Beat the egg whites on high in a completely clean, dry stainless-steel or glass bowl until stiff peaks stand upright, about 2 minutes.
Put the raw honey in a small lightweight stainless-steel saucepan. Heat just until it boils, swirling the pan so the bubbles spread evenly, then remove it from the heat.
Add the bloomed gelatin to the stiff egg whites. With the mixer running continuously, pour the hot honey into the whites in a slow, steady stream aimed between the whisk and the bowl.
Add the homemade vanilla and continue beating until thick glossy peaks form, about 10 minutes. The full beating time gives the topping its finished marshmallow-like body.
Spoon or pipe the meringue immediately for the softest finish. Cover and refrigerate any portion not served; once chilled, the gelatin sets more firmly.