Cut a piece of parchment paper to fit a baking sheet and reserve. Position an oven rack on the second shelf from the top, place the baking sheet on it and preheat the oven to 425 degrees F.
Toast the sesame seeds in a medium skillet over medium heat, stirring occasionally, until lightly browned, 3 to 5 minutes. Transfer to a small bowl. Add the poppy seeds, onion
, garlic and pretzel
salt to the bowl and stir to combine. Reserve.
On a lightly floured surface, gently stretch the pizza dough
into a 12-by-6-inch rectangle about 1/4 inch thick. Brush the melted butter evenly over the top and lightly season all over with kosher salt. Sprinkle 2 tablespoons of the reserved spice blend
on top, making sure that the entire surface is covered. (Reserve the remaining spice blend for another use. See Cook's Note below.) Use a pizza cutter or a sharp knife to cut the dough into eight 6-inch bread sticks.
Remove the preheated baking sheet from the oven and cover with the prepared parchment. Use your hands to carefully lift the bread sticks onto the baking sheet, leaving a little space in between. (If they stretch a little, it is OK.) Bake until the bread sticks are puffed and lightly golden brown, 12 to 15 minutes, rotating the baking sheet halfway through. Serve immediately.
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