Scoop out the center of the tomato halves. In a medium bowl, mix together garlic, scallions, basil, spinach, ricotta, salt, and pepper. Stuff the mixture into the tomatoes. Lightly spray a baking sheet with oil. Place the stuffed tomatoes on the sheet and sprinkle with pine nuts.
Bake on lower rack of a 375 degree oven for 20-25 minutes, watching to see that the pine nuts do not become too brown.