Oxmoor House
Prepare the sauce several days ahead, chill it, and reheat just before serving. You can also use this sauce for fondue.
How to Make It
Heat milk and half-and-half in a heavy saucepan over medium-high heat to 180° or until tiny bubbles form around the edges (do not boil). Remove from heat; add butter and chocolate, stirring until smooth. Stir in rind, juice, and liqueur. Serve sauce with frozen yogurt.