Roasting brussels sprouts with garlic is a delicious, healthy side dish. When roasted, these veggies get charred on the outside and soft on the inside. Afterward, brush them with garlic butter. Roasting brussels sprouts with garlic is a delicious way to make them taste even better. If you don't have time to roast them, store them in the refrigerator in an airtight container. Just pop them into the oven at 350 degrees for five minutes to reheat them.