Notes: Other root vegetables (baby turnips, parsnips, chunks of leeks) can be used; vegetable weight should total about 4 1/2 pounds. Up to 4 hours ahead, roast vegetables; let stand at room temperature. To warm, set roasting pan over medium heat, add remaining ingredients, and stir until steaming. Garnish with rosemary sprigs or roasted garlic.
1 1/2 pounds blue, Yukon Gold, or red thin-skinned potatoes (or a mixture of colors), 2 inches wide