
¼ cup salted butter, softened
2 teaspoon each orange zest and juice
1 teaspoon each lemon zest and juice
2 cloves garlic, minced
1½ oranges, sliced
1½ lemons, sliced
4 (5- to 6-ounce) fresh skinless cod fillets, 1 to 1½ inches thick
Coarse kosher salt
Ground white pepper
1 cup lightly packed baby spinach
3 cups broccolini florets