I think London Broil is Top Round steak.

Here's a Bulgogi recipe that I like to use as a marinade:

- 1/2 cup soy sauce
- garlic (I use a lot...)
- 3 tablespoons sugar (don't use splenda; the sugar helps seal the meat when you grill)
- 2 tablespoons sesame oil (I sometimes use olive oil); if you have some
sesame seeds, you can also add some
- finely chop the top of a scallion

Marinate meat at least 2 hrs. You can leave it overnight in your refrig.