I start by whisking the flour, salt, and dill together in a large bowl so the seasoning is evenly distributed. Then I beat in the room-temperature butter until the mixture looks crumbly, almost like cornmeal. Finally, I mix in the yogurt until everything comes together into a thick, shaggy dough.
Once the dough is formed, I cover the bowl tightly and leave it in a warm spot in my kitchen for 8 to 12 hours. This resting period softens the grain and mellows the flavor, so don't rush this part even though it's tempting.
After resting, I preheat my oven to 450°F and line two baking sheets with parchment. I divide the dough into four pieces, flour my counter, and roll each piece out to about 1/16-inch thick before cutting it into small 1 1/2-inch squares.
I arrange the squares on the baking sheets with a little space between each one, brush them with melted butter, and prick each square with a fork. They bake for just 6 to 8 minutes, until the edges turn golden. I pull them out and let them cool completely on a wire rack before storing