Sea scallops are perfect for speedy (yet totally elegant) weeknight dinners, as they cook to perfection in no time flat. In fact, this ideal dinner for two can be ready on your table in 30 minutes. The capers in this recipe deliver a delicious punch of briny salinity that we absolutely love paired with fresh shellfish. The whole-grain Dijon mustard adds delicate texture to the sauce and the lemon zest delivers an extra touch of brightness. Stirring in the butter at the very end of cooking creates a touch of velvety richness, in that special way only butter can do. Serve this dish over a bed of leafy greens, mashed potatoes, or rice. Feel free to swap basil or cilantro for the chopped fresh parsley we call for here.