Romesco Mackerel Toast with Fried Capers

Mackerel has a wonderfully mild flavor, much like tuna, but the meat is more delicate. I love the way it tastes with a romesco sauce full of roasted almonds, roasted red peppers, and smoked paprika. This warm, smoky toast would make a happy addition to a pot of soup for a dinner party, or you could serve it alongside a salad and a charcuterie spread. Rubbing the warm bread with garlic gives it a little bite without distracting from the fruity, smoky romesco or the tender flakes of fish.