Rhubarb and White Chocolate Tartlets

In this recipe, thin, crisp, golden filo pastry shells are filled with unctuous white chocolate–vanilla mousse and topped with tart rhubarb—a heavenly marriage of crunchy, creamy, and tangy. Harry and Meghan served rhubarb tartlets at their wedding, which recalled a little taste of Harry’s childhood and the wonderful rhubarb grown at Highgrove.