In a small bowl whisk together the cocoa powder and the water until the cocoa powder is dissolved and let the mixture cool to room temperature. In a bowl whisk together the flour, the baking soda, and a pinch of salt. In another bowl, cream together the butter and the sugar. Add the whole egg and the egg yolk, mixing until batter is smooth. Alternate adding cocoa with flour mixture, mixing well after each addition.
Crumble graham crackers and add 1 1/2 Tbsp to each unlined cupcake pan. Press graham cracker down firmly and fill the rest of the tin with the cupcake batter; about 2/3 full. Bake in a 350°F oven for 25 to 30 minutes, or until a toothpick comes out clean.
2.
Whip whites and cream of tartar until frothy, and slowly stream in sugar. Whip until glossy, soft-peaks form.
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