I microwave a lemon for 10 seconds, cut it in half, and lob it into my boiling water with several whole garlic cloves, unpeeled, and some sprigs of rosemary. The potatoes are peeled and chopped to a suitable size. I then parboil for 8-10 minutes. It gets drained, and softly tossed in oil.
Everything, including the lemon, garlic and rosemary onto a hot oven tray. The potatoes get covered with goose fat, or maybe some dripping. More fresh rosemary.
Then I roast them forever. Well maybe not forever, but long enough to get some colour.