Preheat oven to 100°C/210°F (80°C fan) with a shelf positioned in the middle of the oven.
Roasting pan: Place duck in a small metal roasting pan with high sides. They should fit snugly, touching each other, but in a single layer. (Note 5)
Cover with duck fat: Pour fat over duck. It should pretty much cover the legs. (Note 6)
Heat fat in pan: Place pan on the stove over medium-high heat. Heat fat until bubbling energetically all across the surface (ie not just around the edges).
Cover with paper: Turn off stove. Cover surface with baking / parchment paper, cut to size so it sits on the surface of the fat over the duck. Gently push down to remove air bubbles. Cover pan tightly with a double layer of foil.
Slow cook: Carefully transfer to the oven. Cook for 8 hours.
Check flesh: Remove one duck leg (gently). Turn over to check the flesh side – meat should be fall-apart tender. Leg should also give easily when pressure is applied to the joint (see video).
Salt – Measurements are for cooking/kosher salt which have larger grains than table salt. If you only have table salt, reduce by 1/4 (otherwise it will be too salty).
Pan for slow roasting – The key here is size, mine is 27cm x 21cm (10.5″ x 8″). Raw duck should fit in a single layer but snugly, touching, to reduce the amount of fat required to cover it. The duck will shrink as it cooks so snug is fine.
Metal pans are best so you can do the initial heat of the oil with the duck in it on the stove. But if you only have ceramic or glass, pour the duck fat into a saucepan and bring to a boil. Warm the ceramic / glass baking dish by running under hot water, then dry (shock of boiling hot oil in fridge cold glass can make some shatter!) Put duck in per recipe, then pour fat over the duck and place in oven.
Duck fat coverage for cooking – Fat should virtually cover the legs (see photos in post / video). While some fat will be released by the duck itself during the slow roasting time, it doesn’t raise the fat levels. If the highest point of the flesh or the bone ends are poking out a bit, that’s ok.
Cooked duck storage – Fully submerged in fat, will keep for 5 days in the fridge or 3 months in the freezer.
Container can be glass, ceramic or plastic, but key is the size such that the duck fits snugly (stacked or single layer) so they are fully submerged in fat (key for food safety for fridge to ensure it remains preserved).
Traditionally, the duck would be stored for prolonged periods just in a cool place. 99.99% of cases, you can store the duck in your fridge for several months without spoilage. To be cautious, I recommend only 5 days in the fridge else freeze. But if you’re comfortable with storing it the traditional way, feel free.
What to do with used duck fat – Store in an airtight container or jar in the fridge for 6 months or freezer for longer, as long as the fat is clean.
Reusing the fat: Duck fat can be reused around 3 times for Duck Confit before it gets too salty (just taste before use). To check if it’s still OK, smell it. If it smells rancid or smelly, discard. If too salty for Duck Confit, use it for Duck Fat Potatoes!
98% of the duck fat after roasting will be clean, pure fat. But there will be some duck juices which will decrease the shelf life of the fat. To remove this, pour the cooled fat into a jug using a fine mesh strainer. The duck juice will settle at the bottom (fat is clear pale gold, juice is brownish). Then pour the fat off, leaving behind the duck juice.
Alternatively, strain the fat into a jug and let it solidify in the fridge. Then scrape the fat off, leaving behind the juice (which will firm into a jelly). You’ll need to reheat the fat to pour into a container.
Source – This recipe was created in collaboration with Jean-Baptiste Alexandre, a French chef residing in Sydney who works with me on some of the more iconic recipes of the world. If there’s anyone who will know Duck Confit, if it’s a French chef!