Cut the tops off 4 tomatoes and trim a thin slice off the bottoms so that they will sit upright easily. Hollow out the tomatoes with a spoon. Season tomatoes with salt and pepper. Seed and chop remaining tomato.
In a bowl, combine chopped tomato, pimentos, onions, zucchini, jalapeno, lemon juice, oregano and cilantro. Sprinkle bread crumbs evenly over the bowl. Add extra-virgin olive oil in a slow stream. Toss mixture to combine and season to taste with salt and pepper. Fill the empty tomatoes and serve.