Unpack the duck breasts from the packaging and score the skin with a sharp knife.
Peel and dice the celeriac into small cubes so the sides are between 1.5 and 2 cm (0.6 and 0.8 inches).
When the duck breast has finished in the water bath, remove the the duck from the bag and pat it dry with absorbent paper towel.
Disclaimer
I have no culinary training nor qualifications.
This post is not intended to convey any health or medical advice. If you have any health concerns about anything you read, please contact your registered medical practitioner.
The quantities are indicative. Feel free to vary the quantities to suit your taste.
I deliberately do not calculate energy for dishes. I deliberately default to 500 Calories or 500,000 calories because I do not make these calculations.