These delightful and easy lemon bars have everything the traditional ones do – tang, sweetness and a buttery base – plus the added benefit of pistachios folded into the filling and the crust.
Meanwhile, whisk together the filling ingredients. When the crust is baked, pour the filling into the pan and bake until set, about 20 minutes. Let cool completely. Sprinkle with confectioners' sugar and cut into 2-inch squares.