The richness of sear-roasted salmon is contrasted by the bright, sweet-tart salad of fennel and apple that tops it. This recipe features a few unusual spices, namely tart sumac and fragrant fennel pollen. If you can’t find fennel pollen, you can omit it; the dish will still be very flavorful. If you use paprika instead of sumac, the fish and fennel will take on a rich, red hue.