How to Make It
Preheat the broiler. Roast the bell peppers under the broiler for about 10 minutes, or until charred all over. Transfer to a medium bowl, cover with plastic wrap and let steam for about 10 minutes. Peel the peppers and discard the stems and seeds. Cut the peppers into 1/2-inch-wide strips. Return the peppers to the bowl, add 1 tablespoon of the olive oil and season with salt and pepper. Let stand at room temperature.
Meanwhile, preheat the oven to 400°. Wrap the garlic in aluminum foil, put in a baking dish and bake for about 35 minutes, or until the cloves are soft. Let cool slightly, then peel.
Arrange the tomato slices in a single layer on a platter and season with salt. In a small bowl, whisk the remaining 3 tablespoons of olive oil with the vinegar and season with salt and pepper. Scatter the peppers and garlic over the tomatoes. Spoon the vinaigrette over the top, sprinkle with the parsley and serve.