Combine lemon zest and 1⁄2 cup sugar in a medium bowl. The mixture should be fragrant and feel like damp sand.
Wash, hull, and slice strawberries into quarters or halves, depending on size. Add to sugar mixture and gently stir until sugar dissolves into syrup and evenly coats the fruit. Cover and macerate for at least 30 minutes.
Combine heavy cream, remaining 1⁄4 cup sugar, and vanilla extract in a large bowl. Using a hand mixer on medium-low, whisk until the sugar dissolves, about 30 seconds. Increase speed to medium-high and continue mixing until soft peaks form, about 2 minutes. Do not over mix.
Pour meringue cookies into a gallon-size resealable bag, remove excess air, and close. Using a rolling pin, carefully “crack” them into bite-size pieces. (Some will inevitably become powder; reserve for topping.)
Alternate layers of meringue, whipped cream, and macerated strawberries in a clear or light-colored serving dish. No need to be precise—it’s Eton “mess,” after all. (You may not use all the meringue.)
Garnish with additional strawberries, syrup from macerated strawberries, lemon zest, residual meringue crumbs, and mint leaves.