2 bone-in, skin-on duck breasts, about 20 oz total (567 g total) Salt and black pepper to taste 1 / 3 cup (65 g) granulated sugar 2 tbsp (30 ml) white wine vinegar 1 cup (240 ml) fresh orange juice (about 2–3 oranges) Zest of 1 orange 1 / 2 cup (120 ml) chicken stock 1–2 tbsp (15–30 ml) Grand Marnier or Cognac (optional) 2 tbsp (30 g) cold unsalted butter, cubed
1. Score and season duck breasts; render skin in a cold skillet over medium heat until crisp and golden (8–12 minutes). Flip and brown flesh briefly. 2. Finish in a 400°F (200°C) oven 5–8 minutes for medium-rare; remove and rest. 3. For the sauce, sprinkle sugar in a saucepan and melt to a light caramel, stir in vinegar to deglaze and add orange juice, zest, and chicken stock. 4. Simmer until reduced by about half and slightly syrupy; stir in liqueur if using. 5. Off heat, whisk in cold butter pieces to finish the sauce, season to taste, and strain if desired. 6. Slice duck breasts and spoon orange sauce over slices to serve.
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