Sentence:  It's difficult to have a perfectly cooked, cooked-through <WSD>fried egg</WSD> because, by the time the yolk has coagulated, or set, the white is overcooked. You'll usually have to settle for either a runny yolk or a tough white. 
Meaning of the word marked with <WSD> tags:  An egg that has been shallow-fried on one or both sides.