Step 1

Put the potatoes and garlic in a saucepan, cover with cold water and season with salt. Cover and bring to a boil, then uncover and continue cooking until tender, about 15 minutes. Cover and set aside.

Step 2

Meanwhile, rub both sides of the pork chops with the sage, and salt and pepper to taste. Heat a large cast-iron skillet over high heat, then add 1 teaspoon olive oil and sear the chops until golden on both sides, about 5 minutes total. Transfer to a plate. Wipe out the skillet and add the remaining 2 teaspoons olive oil. Add the onion and apples and cook over medium-high heat until lightly browned, about 5 minutes. Season with salt and pepper and stir in the cider.

Step 3

Return the chops to the skillet. Cover and cook, turning once, until just cooked through, 4 to 5 minutes. Drain the potatoes, reserving 1/4 cup liquid. Return the potatoes to the pan; add the buttermilk and mash, adding cooking liquid as needed. Season with salt and pepper. Serve with the pork chops, onion and apples. Drizzle with the pan juices.