1Dip the rim of a martini glass into chocolate syrup, then into the crushed graham crackers. Chill glass in freezer until ready to use.
2Spear the marshmallow with the cocktail straw then coat in chocolate syrup and graham cracker crumbs, set aside.
3Pour all the liquid ingredients into a shaker with ice, and shake until mixed well.
4Pour mix from shaker into glass and sprinkle with a pinch of graham cracker crumbs. Garnish with the marshmallow straw and serve.