Preheat oven to 400 degrees F (200 degrees C). Line a large baking sheet with aluminum foil. Grease a 2-quart casserole.
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Place sweet potatoes on the prepared baking sheet.
Bake sweet potatoes in the preheated oven until tender, about 45 minutes. Reduce oven heat to 375 degrees F (190 degrees C). Let sweet potatoes rest until cool enough to handle. Peel the sweet potatoes and transfer into a large bowl.
Whip sweet potatoes with 3 tablespoons melted butter, 6 tablespoons brown sugar, rum, and salt with an electric mixer, until potatoes are smooth and fluffy, 3 to 5 minutes.
Peel tangelos, section the fruit, and remove membranes, pith, and seeds. Cut sections from 2 tangelos in half crosswise; Set aside sections of remaining 2 tangelos. Gently fold halved tangelo sections into the sweet potato mixture. Transfer sweet potato mixture to the prepared casserole dish.
Arrange reserved tangelo sections atop sweet potato mixture. Combine 3 tablespoons melted butter, 3 tablespoons brown sugar, and pecans in a bowl until crumbly; sprinkle evenly over the dish.
Bake in the preheated oven until heated through and the topping is lightly browned, about 30 minutes.
334.1 calories; 3.37 g protein; 55.22 g carbohydrates; 10.83 g fat; 22.9 mg cholesterol; 378.16 mg sodium.Full Nutrition
*Percent Daily Values are based on a 2,000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.
**Nutrient information is not available for all ingredients. Amount is based on available nutrient data.
(-)Information is not currently available for this nutrient. If you are following a medically restrictive diet, please consult your doctor or registered dietitian before preparing this recipe for personal consumption.