We adapted this recipe from one in D'artagnan's Glorious Game Cookbook, by Ariane Daguin, George Faison, and Joanna Pruess. In her cookbook, Daguin sticks to the traditional French method and cooks foie gras to 120°F, although the USDA recommends cooking foie gras to an internal temperature of 160°F to be sure any harmful bacteria are killed. We tried both methods and prefer Daguin's; to our tastes, it yielded the perfect degree of doneness. However, we've included both options in the procedure.
Whole foie gras can vary in size (goose liver tends to be larger than duck). If your foie gras differs from the recipe by more than half a pound, increase or decrease the size of the terrine, the weight (see "special equipment," below), and the seasonings accordingly. If you don't have an oval terrine, you could use a ceramic soufflé dish or a glass loaf pan that's just large enough for the foie gras to fit in snugly. Note that a foie gras terrine is supposed to have a layer of fat—it may look a bit odd, but it's actually quite delicious.
• Terrine may be made 3 to 5 days ahead, kept chilled in mold with its surface covered with plastic wrap. Once unmolded, terrine keeps, tightly wrapped in plastic wrap and chilled, another 3 days. • Hot terrine lids are hard to grasp with oven mitts; metal tongs are great for grabbing the handle.
