I made a London broil last night. It was wonderful. I found a great cut of top round at the Fresh Market.
I marinated it overnight in soy sauce and a sweet spicy chili sauce and some Worcestershire sauce.
I broiled it for about 20 minutes until it got to about 140 to 145. I turned it once. I had the top rack about 4 inches from the broiler.
it was medium to medium rare on the inside and almost caramelized on the outside. I sliced it width wise. It was delicious.