The Halloween pizza was inspired by the way my mom and I eat pizza--taking a cold salad and putting it on top of a warm pizza. Also, when my daughter Xea was little, we always had pizza before we went trick or treating.
For the salsa verde: Mix the finishing oil, parsley, chilies, oregano, olives and anchovies in a small bowl. Taste and adjust the seasoning with salt, if needed, and reserve.
For the pizza: Preheat a pizza oven to 550 degrees F. If using a regular oven, put a pizza stone in the bottom and preheat the oven to 550 degrees F.
Blend the plum tomatoes with the olive oil, garlic and salt to taste in a blender.
Slice the mozzarella into 2-inch-thick slices. Use a ghost-shaped Halloween cookie cutter to cut out mozzarella ghosts.
Roll out one of the pizza dough balls to about 12 inches and put on top of a pizza peel. Spoon the tomato sauce all over the pizza, drizzle with finishing olive oil and sprinkle with salt. Bake until the crust is slightly golden brown, about 5 minutes.
Carefully remove the pizza from the oven, assemble with the mozzarella ghosts, salsa verde and arugula, drizzle with lemon juice and garnish with freshly grated Parmigiano-Reggiano. Repeat with other pizza dough and serve immediately.