3 Golden Delicious applespeeled, halved, cored and cut into eighths
1 tablespoon canola oil
Two 1 1/4- to 1 1/2-pound pork tenderloins, each cut into 6 medallions
Salt and freshly ground pepper
1 cup Late Harvest Riesling
2 1/2 cups chicken stock or canned low-sodium broth
In a large skillet, melt the butter over moderately high heat. Stir in the brown sugar, then add the apples in a single layer and cook until golden brown and tender, 3 to 4 minutes per side.
In another large skillet, heat the canola oil over moderately high heat. Season the pork medallions generously with salt and pepper and cook until golden brown all over, about 15 minutes. Transfer the pork to a serving platter and keep warm.
Add the Riesling to the second skillet and cook over high heat until reduced to 1/4 cup, about 3 minutes. Add the stock and simmer until the sauce reduces slightly, about 12 minutes; season with salt and pepper. Add the apples and cook over moderately low heat until warmed through. Pour the apples and sauce over the pork and serve.
A Napa Valley Riesling with hints of crisp apple and a slight edge of sweetness will point up the sauce here.