Welsh rarebit is a traditional British dish made from a savory cheese sauce served over toasted bread. The cheese sauce typically includes ingredients like cheddar cheese, mustard, and beer or ale, giving it a rich and flavorful profile. It is often broiled until bubbly and golden, making it a comforting and indulgent meal. This dish is believed to have originated in Wales and has been enjoyed since the 18th century. While it is commonly served as a snack or light meal, variations exist, with some recipes incorporating additional ingredients like tomatoes or spices for extra flavor.