Can't find monkfish? Any whitefish (or even a salmon fillet) would be great here.
In baking dish, coat fish with 1 tbsp. olive oil. Roast at 425° for 15 minutes; season. In medium skillet, cook onion, chorizo, and garlic in remaining oil over medium-high for 8 minutes. Add tomatoes, olives, and raisins; simmer for 5 minutes. Spoon over fish; garnish.