Preheat oven to 350 F. Lightly grease an 8x4 metal bread pan.
In a mixing bowl, mash the banana well, until no large chunks are left. An avocado masher is great for this. Add the applesauce, olive oil, sugar, and vanilla and use a strong fork to mix well. Mix in the grated zucchini.
Sift in 1 cup of the flour, the cinnamon, allspice, baking soda, and salt. Mix to combine. Add the walnuts, raisins, and final 1/2 cup of flour, and mix just until no visible flour is left. Don't overdo it, lumpy is fine.
Transfer the batter to the prepared pan and bake for 50 to 55 minutes. Test the center with a toothpick or knife. If it needs more time, turn the heat down to 325 F and bake an additional 10 to 15 minutes.
Let cool in the pan for 10 minutes, then transfer to a cooling rack to cool completely before slicing. I know. Patience.