While the garlic is cooking, wash the broccoli rabe thoroughly. Add it to the saucepan with the water still clinging to its leaves. Cover the pan tightly and cook the broccoli rabe for 20 to 30 minutes, until it is very tender and just a few spoonfuls of water remain. When the broccoli is tender, add to the sauce with a little salt and the olives. Toss and serve hot.