*If using a food mill, there is no need to peel. The potatoes will have more flavor when cooked with their peels on. If using a potato ricer or potato masher, peel the potatoes before cutting.
*Don't fear the seemingly insane amount of garlic. When poached in oil, it becomes sweet and neutral, almost like roasted garlic but more tender. If you're a garlic lover and really want the flavor to come through, use 3 heads. If you want the garlic flavor to be more subtle in the background, use 2 heads, or in any amount to taste.