Give some stream of consciousness and then the answer. Although butchers may label top round steak or roast "London broil", the term does not refer to a specific cut of meat but to a method of preparation and cookery.

Based on this passage, which part of the cow is london broil?
To answer the question, consider the following: Although butchers may label top round steak or roast "London broil", the term does not refer to a specific cut of meat but to a method of preparation and cookery.
Therefore, the answer is the term does not refer to a specific cut of meat but to a method of preparation and cookery.