On Christmas, many fast food restaurants are open, including McDonald's, Taco Bell, Burger King, and Wendy's. These restaurants often have extended hours on Christmas Day to accommodate those who may not have time to cook or those who just want a quick meal. Additionally, some grocery stores are open and may have prepared food options available for purchase. It's important to check with your local restaurants and grocery stores to confirm their holiday hours, as some locations may be closed on Christmas Day.