Slice the potatoes in half and place in a 10-inch Dutch oven or casserole dish. Stir in the onions and garlic.
Pour the root beer in until it reaches about halfway up the potato mixture.
Cover and let set about 10-15 minutes.
Bake at 375 degrees F., uncovered, for about 40 minutes or until the potatoes are tender.
To caramelize onions: Add 1 large yellow onion (cut into rings), 1 garlic clove (minced) and about ½ cup rootbeer to a medium skillet. Cook over medium-high heat until the onions soften and most of the rootbeer cooks out, stirring occasionally. Serve with potatoes or on top of a steak, etc.
