Garlic and Rosemary Potato Puree

Infusing liquid—cream, milk, or stock can all be used in this recipe—with herbs is a simple yet effective way to add depth of flavor to purees and other preparations (see the gratin on page 320). Garlic is a complementary flavor for potatoes; we boiled the cloves along with the potatoes to mellow their flavor, but you can use Oven-Poached Garlic instead (page 306). For a lighter-bodied puree, replace the cream with milk or stock, or use a combination. For a richer puree, reduce 1 1/2 cups of heavy cream by half, then infuse with herbs.