- What should I do with the rendered fat?
- Never throw it away! Strain it and refrigerate. Duck fat is liquid gold for roasting other foods (e.g. potatoes).
- Why isn't the skin crispy?
- It didn't cook long enough, or steam softened it again. In the final phase (without foil) it needs high heat.
Roast duck with onion mashed potato
Duck roasting is a game of patience. Duck has a thick layer of fat under the skin, which must be rendered slowly (a confit-style process in its own fat) so the skin becomes paper-thin and crispy, and the meat tender. The onion mash elevates the classic side dish; the sweetness of caramelised onion pairs wonderfully with duck.
Ingredients
4
pcs
duck legs
1
kg
potatoes (floury)
2
heads
onion
50
g
butter
200
ml
milk (warm)
1
tbsp
duck fat or oil
3
cloves
garlic
1
bunch
fresh thyme
2
tsp
salt
1
tsp
ground black pepper
1
bunch
fresh parsley
Shopping List (0)
Equipment Needed
- Roasting tin with rack insert (optional) - So the duck doesn't swim in fat (though many like it that way).
- Potato ricer/masher - For fluffy mash.
- Frying pan - For frying the onions.
Allergen Information
Milk
Instructions
1
✓
Rub the duck legs with salt, pepper, and crushed garlic. Place in a roasting tin, scatter the thyme around them, and pour in a little water (approx. 50ml).
Tip: Salting helps draw water out of the skin, which is a prerequisite for crispiness.
2
✓
Cover with foil and roast at 160°C for approx. 1.5 hours. The duck slowly steams in its own fat and vapour.
Tip: Low heat breaks down collagen. If you rush it, it will remain tough.
3
✓
Meanwhile, boil the potatoes in salted water. Finely chop the onion and fry in the fat until dark golden brown (caramelisation).
Tip: The onion shouldn't burn, but caramelise slowly to become sweet.
4
✓
Mash the potatoes, mix in the butter, warm milk, and fried onions.
Tip: Heat the milk, otherwise it will cool the potatoes down and make them gluey.
5
✓
Remove the foil from the duck, increase heat to 200°C (or grill), and roast until the skin is red and crispy (approx. 15-20 minutes).
Tip: Baste with the fat during cooking; this helps heat transfer and browning.
Recipe FAQ
Ingredients
- 4 pcs duck legs
- 1 kg potatoes (floury)
- 2 heads onion
- 50 g butter
- 200 ml milk (warm)
- 1 tbsp duck fat or oil
- 3 cloves garlic
- 1 bunch fresh thyme
- 2 tsp salt
- 1 tsp ground black pepper
- 1 bunch fresh parsley