This simple fish dinner is all about contrast: tender, flaky white fish over a bed of spinach, paired with a vibrant, citrusy sauce that’s equal parts briny, sweet and gently spiced. The sauce comes together in minutes; olive oil gets infused with garlic, orange zest and turmeric, then balanced with vinegar, honey and plenty of chopped capers. The result is bright and aromatic, with just enough richness to coat the fish beautifully. The olive oil gives it a smooth, rounded depth, while a touch of butter ties everything together into a silky, golden sauce. It’s the kind of meal that feels fresh and nourishing, but still quick enough for a weeknight. Serve it with rice, couscous, or plenty of bread to soak up every last bit.