1. Preheat the oven to 350ºF (180ºC.) Generously butter a 9-inch (23cm) springform pan, or 10-inch (25cm) round cake pan.
2. In a medium bowl, whisk together the flour, cinnamon, cloves, baking soda, and salt. Set aside.
3. In a large bowl, whisk together the sugar and the eggs. In a slow, steady stream – as if you were making mayonnaise – whisk in the oil, stirring constantly as you pour, to keep it emulsified. Whisk in the Calvados.
4. Using a spatula, mix in the dry ingredients, then fold in the diced apples and nuts. Scrape the batter into the prepared cake pan and bake for 90 minutes. Because the cake is so dense, it may feel done on top (and a toothpick inserted into the center may come out clean), but it will likely need to full baking time for the cake to be cooked through.