A kick of fresh ginger juice enlivens the subtle flavors of this easy sauce. Slideshow: More Chicken Thigh Recipes
Preheat oven to 325°
Season the chicken thighs with salt and pepper. In a large skillet or Dutch oven set over medium-high heat, add the oil and heat until shimmering. Brown the thighs skin side down, about 5 minutes. Turn over and brown all other sides, about another 5 minutes.
Drain off most of the rendered fat, then add the onion. Reduce the heat to medium. Cook, stirring, until the onion is fairly soft and translucent, about 10 minutes. Add the cider and bring to a boil. Reduce by half, about 5 minutes. Add the chicken thighs, then cover the pan and place in the oven. Cook for 15 minutes then flip each piece. Add the apples, cover the pan again and cook until the thighs are tender and falling off the bone, about another 15 minutes.
Skim off most of the fat from the sauce, then, over the sauce, squeeze the grated ginger with your hands so that its liquid goes into the sauce. Serve the thighs in bowls with the sauce.
The chicken can be prepared through step 3. Separate the sauce and thighs and refrigerate. When preparing day of, skim the fat from the sauce, then warm the chicken in the sauce and proceed.
Never tried adding cider before.