Pistachio, Grand Marnier and Olive Oil Cake

This requires a really good-quality olive oil, Grand Marnier or a dessert wine of your choice. You will only use a couple of tablespoons in the recipe, but the wine will be a perfect accompaniment to the cake, should you choose to use it. Pistachio nuts or almonds - the choice is yours - result in very different cakes. Ground almonds make a lighter cake, whereas pistachio nuts give a denser, beautifully pale green crumb.