Mix the blueberries, veal stock, port wine, thyme and shallot together in a saucepan. Bring to a boil and simmer until it reduces by half.
Score the duck breast, then pan-sear it skin-side-down for about four minutes. To finish it off, roast the duck for breast six minutes, until medium rare.
Pour the reduction over the duck and enjoy.
Video
Notes
Adjust the cooking time according to the thickness of the duck breast and personal preference for doneness.