The buttered rum cocktail , as the name implies, is made with a lot of spiced butter and rum. Like a spiced cookie right out of the oven, the warm cocktail is sweetened with brown sugar and orange juice. Rich and decadent, this sinful drink is sure to keep you warm during chilly months. Hosting a get-together? Make a large batch in a slow cooker and let guests serve themselves. Watch the video to see how it comes together.