Foryoueats: Everything-Bagel Rugelach With Onion Jam Recipe

Ingredients

• For the Dough:
• 4 1/4 ounces all-purpose flour (about 1 cup, spooned; 118g), plus more for dusting
• 4 ounces cold unsalted butter (8 tablespoons; 115g), cut into large cubes
• 4 ounces cold cream cheese (8 tablespoons; 115g), cut into large cubes
• 1/8 teaspoon Diamond Crystal kosher salt; for table salt, use half as much by volume or use the same weight
• For the Filling:
• 2 tablespoons (30ml) grapeseed or other neutral oil
• 1 pound yellow onion, cut into 1/2-inch dice (about 3 cups)
• 1 3/4 ounces (about 1/4 cup, firmly packed) light brown sugar
• 2 tablespoons (30g) unsalted butter
• 1/2 cup (120ml) black coffee
• 1/4 cup (60ml) unsulfured molasses, not blackstrap
• 1/4 cup (60ml) apple cider vinegar
• 1/2 teaspoon kosher salt
• 1/4 teaspoon black pepper
• 2 tablespoons sour cream or crème fraîche
• 2 tablespoons fresh bread crumbs
• For the Everything-Bagel Spice Mix and to Finish (see note):
• 1 teaspoon poppy seeds
• 1 teaspoon sesame seeds
• 1 teaspoon coarse sea salt or pretzel salt
• 1/2 teaspoon caraway or nigella seeds
• 1/2 teaspoon dehydrated onion
• 1/4 teaspoon dehydrated garlic
• 1 egg yolk whisked with 1 teaspoon (5ml) cool water