Tangy, spicy, savory-sweet mostarda is a classic Italian fruit and mustard condiment. It’s an ideal accompaniment to pork tenderloin, as it brings bold, punchy flavor to the lean, mild cut. We make a non-traditional mostarda, with both prepared mustard and mustard seeds adding spiciness to fresh apple and dried cherries. We sear the seasoned tenderloins in a skillet on the stovetop, add the mostarda ingredients, then slide the pan into a hot oven. When the pork is done, it comes out of the skillet and the fruits and seasonings cook down to form a chunky, slightly syrupy relish. Chopped fresh tarragon, with its notes of licorice, lends another layer of flavor complexity as well as herbal freshness.