1.
In a medium bowl, whisk together the all-purpose flour, semolina flour, baking powder, baking soda, and salt. In another medium bowl, whisk together the butter, peanut oil, and sugar. Add the milk, yogurt, and vinegar and continue to whisk until well combined. Add the dry ingredients to wet ingredients. Using your hands, knead the dough by stirring and squeezing it together until the ingredients are combined, two to four minutes. Preheat the oven to 350 degrees Fahrenheit. Line a baking sheet with Gefen Parchment Paper.
2.
Spoon out about one and a half tablespoons (30 grams) of the dough and roll into a ball in the palm of your hand. Flatten the dough into a two-and-a-half-inch round and fill with half a tablespoon of walnuts. Starting at the top, pinch the edges together over the filling to seal, creating a kayak shape. Press an extra-coarse grater against the top of the dough to indent the dough with the small round shapes on the grater. Repeat to make more cookies, placing them one and a half inches apart on the prepared baking sheet.
3.
Bake until lightly golden brown, 25 to 27 minutes.
4.
Using a spatula, immediately and carefully transfer the cookies to a 9 × 13-inch baking dish. The cookies should be touching. Pour the cooled syrup over the hot cookies. It may look like too much syrup at first, but don’t worry, it will soak into the cookies. Cover with plastic wrap and let rest at room temperature for four to eight hours or overnight, until the dessert soaks up all of the syrup.
5.
Sprinkle with crushed pistachios to serve.
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