Italy’s Jews used pumpkin and squash often in their cooking, so it shouldn’t be a surprise that they used it in cake. This beautifully moist and flavorful adaptation of a couple of Jewish-Italian recipes features my special addition of orange-mascarpone topping. The cake is best made the day before serving and stores nicely at room temperature, though you can refrigerate it if you like; make the topping up to 6 hours ahead.
For a nondairy dessert, omit the topping and simply dust the cake slices with confectioners' sugar.