Drizzling a mild, white fish with caper-spiked browned butter is classic for a reason. The butter adds richness to the lean fish, and the tanginess of capers and lemon perks up any mellowness. In this version, adapted from the chef Danielle Alvarez’s cookbook “Always Add Lemon” (Hardie Grant, 2020), nori oil adds another layer of umami flavor. It’s both bright and deep, with a silky texture that’s easy to achieve. Serve it with rice or bread to mop up all the saline, buttery juices