Meanwhile, heat remaining 3 tablespoons oil in a large skillet over medium heat. Squeeze pulp from skins of roasted garlic into skillet, and add sliced garlic. Cook 2 minutes. Using tongs, transfer pasta directly from boiling water to skillet. Toss to coat. Add 2 tablespoons grated bottarga, the parsley, and half the breadcrumbs, and toss. Transfer to a platter. Season with salt.