1. Simmer port and orange juice in small saucepan over medium heat until reduced to 1/2 cup, 25 to 30 minutes. Transfer to medium bowl; cool to room temperature.

2. Whisk vinegar, cream, marmalade, thyme, salt, and pepper into cooled port reduction. Whisk in oils until incorporated. (Can be refrigerated up to 3 weeks.)

Makes about 1 cup