...that is, it looks undercooked.
A bacon butty (or sarnie)
is a form of butty (sandwich) made from bacon (streaky or back), cooked to preference and placed between two slices of white or brown bread, usually with some form of sauce, such as tomato ketchup or brown sauce. With no sauce at all, it is referred to as a dry bacon butty. The bread may or may not be toasted or buttered.
Bacon butties are an all-day favourite throughout the United Kingdom. Many people in the UK prefer the bacon to be cooked longer, making it more crispy.
Items such as egg, baked beans, mushrooms, black pudding or sausages (any item commonly found in a full English breakfast) may also be added.
An American parallel to the bacon butty is the BLT (bacon, lettuce and tomato) sandwich.