Charred Broccoli Rabe With Ajo Blanco Sauce

Name: Charred Broccoli Rabe With Ajo Blanco Sauce
Ingredients: 1 1/4 ounces crusty country-style loaf or baguette; 3 1/2 ounces garlic cloves (from about 2 small heads), peeled; 1 cup extra-virgin olive oil; 1/2 cup/3 ½ ounces roughly chopped roasted cashews; 2 tablespoons sherry vinegar; Salt; 3 large bunches broccoli rabe (about 3 pounds), thick stems trimmed; 6 tablespoons olive oil, plus more if needed; 2 small lemons, halved crosswise; 2 garlic cloves, finely grated; 2 pinches red-pepper flakes