Special equipment: a 9-by-5-inch loaf pan that is at least 2 inches deep
Add the peach slices to a medium bowl. Drizzle 2 tablespoons of the honey over the peaches and toss until coated. Set aside for at least 30 minutes.
Beat the yogurt, heavy cream and remaining 4 tablespoons honey in a large bowl with an electric mixer on medium-high speed until stiff peaks form, about 2 minutes.
Line a 9-by-5-inch loaf pan that is at least 2 inches deep with plastic wrap, leaving about 2 inches of overhang on all sides. Spread a heaping 1/2 cup of the yogurt-cream mixture over the bottom of the pan. Evenly layer about 14 slices (about 1/2 cup) of the peaches over the cream. Top with 1 1/2 sheets of graham crackers. Break up the remaining 1/2 sheet into small pieces and use them to fill in the gaps. Repeat twice with the remaining yogurt-cream mixture, peaches and graham crackers (making sure to end with a layer of graham crackers on top). Cover the top of the pan with the overhanging plastic wrap. Refrigerate for at least 8 hours and up to 12.
When ready to serve, unwrap the top of the loaf plan and invert it onto a flat plate or cutting board. Remove the plastic wrap, sprinkle with the pistachios and drizzle with honey.
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