Serves 2 Time requirements 25-30 minutes. What you will need: 12-16 ounces of firm white fish fillet, in two pieces, 1-1¼ inch thick. Thinner fillets, ½ to ¾ inch thick, work too; but cut the cooking time from 8 minutes to 4 minutes for thin fillets. ½ teaspoon kosher salt ½ teaspoon freshly ground white pepper. 2 tablespoons diced cucumber. 1 teaspoon capers (preferably packed in salt). 3 tablespoons white wine. 3 tablespoons cucumber juice. 3 tablespoons butter. Spray oil.