Preheat oven to 475°F. Sprinkle quartered tomatoes with salt, pepper, and oregano.
Place tomatoes skin side down on a sprayed baking sheet. Roast for 10 minutes.
Scatter torn prosciutto around the tomatoes and roast for an additional 10 minutes.
Meanwhile, heat a little olive oil in a skillet over medium heat. Add minced garlic and ground chilies, sauté for 2 minutes.
Add chopped anchovies and cannellini beans to the skillet. Sauté for 2 more minutes.
Add a little water to loosen the mixture, then mash with additional olive oil to desired consistency. Keep warm.
Heat olive oil in a large skillet until very hot. Season scallops with salt and pepper.
Sear scallops for 2 minutes on each side until golden brown and cooked through.
Toss seared scallops with a little lemon vinaigrette.
Place warm bean puree on plates. Arrange scallops, roasted tomatoes, and crispy prosciutto on top. Scatter fresh arugula over the dish.