Canard a l'Orange (French Roast Duck with Orange Sauce)

A gastrique is caramelized sugar deglazed with vinegar, the classic French base for fruit sauces served with rich meat. In sauce bigarade it does two jobs: the caramel gives depth and a faint pleasant bitterness, and the vinegar supplies the acidity that cuts the duck's fat. Get it right and the sauce is sharp and balanced; skip it or stop the caramel too early and you end up with the sweet, sticky orange sauce that gave the dish a bad name in the 1970s.

Bigarade, or Seville, oranges are bitter oranges — the original fruit for this sauce, and the source of its name. They're intensely aromatic, sour, and too bitter to eat raw, which is exactly what the dish wants. They're only in season briefly in late winter. The usual modern approach is sweet oranges with lemon juice added to restore the acidity, sometimes with a strip or two of extra zest for the bitter note. Blood oranges also work well.

Three things. Prick the skin all over with a skewer, angling it so you pierce the fat layer without going into the meat, which lets fat escape as it renders. Start the roast hot, around 200°C, then lower it. And pour off the accumulated fat from the tin every 25 minutes, since a duck sitting in its own fat steams rather than crisps. Leaving the duck uncovered in the fridge overnight to dry the skin helps further.

Yes, and it's a common restaurant approach that's much faster. Score the skin in a crosshatch without cutting the meat, start the breasts skin-side down in a cold dry pan, and let the fat render slowly over medium heat for 6–8 minutes until the skin is crisp, then flip briefly and rest. Make the sauce separately with good chicken or duck stock. You'll lose the roasting juices, so a well-made stock matters more.

Keep the sides restrained, since the sauce is the star. Classic partners are pommes sarladaises or simple roast potatoes cooked in the duck fat you've poured off, along with a green vegetable such as green beans, braised chicory, or wilted spinach. Peeled orange segments and a little watercress go on the platter itself. A medium-bodied red like a Pinot Noir is the standard pairing.