Sheet-pan chicken thighs with a pan sauce from the drippings

The best part of a sheet-pan chicken dinner is usually washed down the sink: the browned juices and rendered fat stuck to the tray. This recipe turns them into a glossy sauce in five minutes, with a splash of stock, mustard and a knob of butter.

Serves 4. Active time: 20 minutes. Total time: 50 minutes.

Ingredients

• 8 bone-in, skin-on chicken thighs, about 1.3 kg (3 lb)
• 2 teaspoons fine salt
• 1 teaspoon smoked paprika
• ½ teaspoon black pepper
• 2 red onions, cut into 8 wedges each through the root
• 2 lemons, halved
• 3 tablespoons olive oil
• 6 thyme sprigs

For the pan sauce

• 180 ml (¾ cup) chicken stock, hot
• 2 teaspoons Dijon mustard
• 20 g (1½ tablespoons) cold butter
• 1 tablespoon chopped parsley

Method

1. Heat the oven to 220°C (425°F). Pat the chicken dry with paper towels, especially the skin.
2. Mix the salt, paprika and pepper and rub it all over the chicken, a little under the skin too.
3. Toss the onions and lemon halves with 2 tablespoons of the oil on a large rimmed sheet pan. Push them toward the edges.
4. Set the chicken skin side up in the center, with a finger’s width between each thigh. Brush the skin with the last tablespoon of oil and scatter the thyme over everything.
5. Roast for 35 to 40 minutes, until the skin is deep golden and the thickest thigh reads at least 74°C (165°F). Thighs are better at 80 to 85°C (175 to 185°F), where the connective tissue has softened.
6. Move the chicken, onions and lemons to a platter and let rest. Leave every bit of juice on the tray.
7. Spoon off all but about 1 tablespoon of fat. Pour the hot stock onto the hot pan and scrape hard with a wooden spatula until the browned bits dissolve.
8. Pour the liquid into a small saucepan. Squeeze in the juice from two roasted lemon halves and add the mustard. Boil for 2 to 3 minutes until reduced by about a third.
9. Take it off the heat and swirl in the cold butter until glossy. Add the parsley, taste, and pour over the chicken at the table.

Why the sauce works

The brown layer on the tray is called fond. It is concentrated chicken juice that has dried out and browned in the oven’s heat, which makes it intensely savory. Hot liquid dissolves it in seconds. That is all deglazing is.

The cold butter at the end does two jobs. As it melts into the reduced liquid while you swirl, its fat breaks into tiny droplets held in place by the milk proteins and the mustard, which is a strong emulsifier. The result coats a spoon instead of running off the plate. If the sauce boils after the butter goes in, the emulsion breaks and turns greasy, which is why the pan comes off the heat first.

Swaps

• No stock: use 120 ml (½ cup) water plus 60 ml (¼ cup) dry white wine. Boil it a little longer to cook off the alcohol.
• Boneless thighs: they work, but cook in 20 to 25 minutes and give less fond. Add 1 teaspoon of soy sauce to the sauce for depth.
• Vegetables: swap the onions for fennel wedges, or add 500 g (1 lb) of halved baby potatoes, tossed in oil, 15 minutes before the chicken goes in.
• Mustard: wholegrain gives texture; a teaspoon of honey rounds out the lemon.