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1
Heat oven to 375.
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2
With paring knife, make four incisions in skin of duck: one between leg and breast on each side of duck, and one between wing and back on each side.
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3
Make a spice mixture with 1 teaspoon rosemary, 2 teaspoons sage, 1 chopped garlic clove, 1/4 teaspoon salt and 1/4 teaspoon pepper.
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4
Stuff incisions with pinches of mixture.
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5
In a medium-size bowl, combine sausages, pancetta, bread, celery in small dice, carrots in small dice, 1/2 cup chopped onion, diced orange, remaining chopped garlic, remaining rosemary and sage, 1 1/2 teaspoons Tuscan spice, a half-teaspoon salt and a half-teaspoon pepper.
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6
Drizzle juice of one orange over ingredients, and mix well.
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7
Season cavity of duck with 1/4 teaspoon salt and 1/4 teaspoon pepper, stuff with mixture, and truss with a toothpick, a skewer or butcher's thread.
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8
Pour olive oil into a 9-by-13-inch roasting pan.
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9
Place duck in pan, breast side up.
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10
Rub surface of duck with oil from pan, and roast 40 minutes.
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11
Remove pan from oven, transfer duck to a cutting board, and pour off all but 1 tablespoon fat.
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12
Add remaining celery, carrots and onion to pan in an even layer, and place duck on vegetables, breast side up.
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13
Drizzle juice of one orange and Grand Marnier over duck, season duck with remaining Tuscan spice, 1/4 teaspoon salt and 1/4 teaspoon pepper, and layer slices of one orange over breast.
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14
Return to oven, and roast 2 hours, basting with pan juices every 20 minutes.
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15
Once orange slices on breast have browned, add them to pan, pour juice of remaining orange over duck, and layer slices of second orange over breast.
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16
Raise oven to 400 degrees for final 20 minutes of cooking.
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17
Remove duck from oven, and transfer to a cutting board.
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18
Remove all but 4 orange slices from pan, and discard.
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19
Spoon off any excess fat, and discard.
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20
Puree contents of pan in a food processor, and heat in a small saucepan over medium-high heat to reduce while you carve duck.
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21
Adjust seasonings, and pour sauce over carved duck.
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22
Serve.