Step 1
Place a rack in center of oven; preheat to 350°. Combine 1½ tsp. paprika, 1 Tbsp. Diamond Crystal or 1¾ tsp. Morton kosher salt, and 1½ tsp. freshly floor pepper in a small bowl. Pat 2½ lb. skin-on, bone-in hen thighs (about 6 medium) dry and sprinkle throughout with spice combination. Put aside.
Step 2
Warmth ¼ cup extra-virgin olive oil in an ovenproof Dutch oven or different heavy pot over medium. Cook dinner 2 small oranges, minimize into quarters, on minimize sides till browned and blackened in spots, about 2 minutes per aspect. (Oil would possibly spatter, so have a lid close by to position on prime if wanted.) Switch oranges to a big plate.
Step 3
Add extra oil to identical pot if dry and cook dinner 3 small purple onions, roots trimmed, with ends left intact, peeled, quartered by root ends, on minimize sides till browned, about 2 minutes per aspect. Switch to plate with oranges. Add 12 garlic cloves, peeled, to pot and cook dinner, stirring typically, till browned, 2–3 minutes. Switch to plate with oranges and onions.
Step 4
Working in batches if wanted, cook dinner reserved hen thighs,
pores and skin aspect down, in pot, undisturbed, till deep golden brown beneath and so they launch
simply from pan, 7–9 minutes. Flip pores and skin aspect up and switch to a separate plate.
Step 5
Cook dinner 2 Tbsp. all-purpose flour in pot, stirring continually, till no dry pockets stay, 30–60 seconds. Steadily pour in 2 cups orange wine, dry rosé, or tart, high-acid white wine, whisking continually to forestall clumping, then stir in 1 cup contemporary orange juice, 1 cup low-sodium hen broth, ⅓ cup Dijon mustard, 4 Tbsp. unsalted butter, 1 Tbsp. granulated sugar, remaining 1 tsp. Diamond Crystal or ½ tsp. Morton kosher salt, and remaining 1 tsp. freshly floor pepper. Deliver to a boil and cook dinner till sauce is decreased by half and thinly coats a spoon, 8–10 minutes. Style sauce and season with extra salt and pepper if wanted.
Step 6
Take away pot from warmth and scatter oranges, onions, and garlic round. Nestle hen thighs in, pores and skin aspect up, in order that they’re about midway in sauce; add 4 sprigs rosemary, tied along with kitchen twine. Roast in oven, uncovered, till hen could be very tender and simply pulls away from bones, about 1 hour.
