Watch Chef John make a super-simple brown butter sauce that goes with just about any white fish. You’ll see how to brown the butter, turning it into a light tan color with a wonderfully nutty aroma. Then you’ll add the chopped walnuts, cool it down with a splash of lemon juice, and toss in chopped fresh tarragon. That’s all there is to it! Watch the video, then get the recipe for Chef John’s Tarragon Walnut Brown Butter Sauce. It’s great spooned over tilapia, snapper, bass, black cod, sole—any white fish.