Lemon-Caper Butter Sauce
Prep Time:
Cook Time:
Servings:
Ingredients
  • 1/4 cup fresh lemon juice, plus more if needed
  • 1 tablespoon white-wine vinegar
  • 1 tablespoon minced shallot
  • 1/2 cup very cold unsalted butter in one piece, plus 1/2 tablespoon if needed
  • 1 tablespoon drained capers, chopped
  • 1 tablespoon chopped flat-leaf parsley
  • 2 teaspoon light packed finely grated lemon zest
  • kosher salt and freshly ground black pepper
Directions
  1. In a small saucepan, combine the lemon juice, vinegar, and shallot and bring to a simmer over medium-high heat. Cook, stirring and scraping the sides of the pan occasionally with a heat-resistant rubber spatula, until the liquid is reduced to about 2 tablespoons, 4-5 minutes.
  2. Add the butter and start stirring it around in circles with a whisk, a fork, a wooden spoon, or anything that lets you "stab" the hunk of butter so that you can move it around easily. The butter will start to melt and the mixture will bubble and boil around the edges. The melted butter should look creamy, rather than melted and oily. Keep stirring and blending until almost all of the butter is incorporated, then remove the pan from the heat as you work in the last bit. Whisk in the capers, parsley, lemon zest, ¼ teaspoon salt, and a few generous grinds of pepper. Taste and adjust the seasoning with salt and pepper if needed. If the sauce is still very sharp, whisk in another ½ tablespoon cold butter. If possible, serve right away.
  3. Variation: Omit the parsley and add 1 tbsp chopped fresh dill and 2 tsp finely diced cornichon with the capers.