[header] How to make lemon meringue parfait [title] Stir the graham cracker crumbs and melted butter together. [step] Doing so will smother the crumbs with butter, which is essential for the crust. [substeps] Don't make the crumbs extremely small; crumbs the size of a chocolate chip would work well.
One of the ways to crush the graham crackers (and a bit fun) is to smash the crackers with a rolling pin. Put it inside a bag first to prevent some mess if you wish.