Whisk together all ingredients except rum, or mix in blender.
Heat on medium in a medium saucepan whisking occasionally until it starts to thicken. Then whisk continuously until mixture coats the back of a spoon, about 175F.
Cool then serve, with or without added rum.
Refrigerate leftovers.
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Nutrition
Calories: 397kcal
I am not a health professional and nutrition data is calculated programatically. Accuracy may vary with product selection, calculator accuracy, etc. Consult a professional for the best information.