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Pulse the pistachios 4-5 times in a food processor or until coarsely ground. Add in the flour, salt, and sugar and pulse another 2-3 times or until combined. Add in the butter and pulse until a coarse meal is formed. While the food processor is running, slowly add in the ice water until a dough ball as formed. Wrap the dough in parchment paper and stick in the fridge for at least a half an hour.
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While the dough is chilling, whisk together the yogurt, garlic, and goat cheese until a smooth sauce has formed. Season with salt and paper and refrigerate until ready to use.
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Once the dough has chilled, remove from fridge and divide into four equal parts. Preheat oven to 400 degrees and line a baking sheet with parchment paper. Roll out one of the 4 pieces of dough into a rough circle shape and top with a 4th of the goat cheese sauce, 1 Tablespoon of dill, a thin layer of potatoes and leeks, and then top with another Tablespoon of dill; Fold the sides in towards the filling to create a crust that only slightly overlaps the filling and transfer to a parchment paper lined baking sheet. Repeat with the rest of the dough and filling until you have 4 galettes on the parchment paper ready for baking. Brush the egg wash over the crust of all the galettes. Bake for 30-40 minutes or until the crusts have browned and the potatoes are soft.
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Garnish with more dill and crush pink peppercorn; drizzle honey over the top and serve warm.