Preheat oven to 425°F.
Oven tray #1: thinly sliced broccoli and leeks, whole cloves of garlic, whole black pepper, salt, olive oil. Rub it all together so everything is nicely coated with oil, including the tray.
Oven tray #2: wedge cut potatoes, whole cloves of garlic, rosemary, salt, olive oil. Rub together.
Stick both trays in the oven, check each for doneness every once in a while, pull out when done. Enjoy!