Torta di Pistacchio

This is a simple cake masquerading as a fancy cake. The cake itself is a pistachio sponge—light and airy, with a hint of lemon. The ricotta filling, tinged pale sage with pistachio cream, is both luxurious and ridiculously easy to make. You don’t have to worry about frosting here. A shower of confectioners’ sugar and a ring of chopped pistachios around …