London Broil is one of my favorite ingredients on Planet Shibboleth.  It's very very lean and one of the few red meats that is lean enough to have a category 3 vegetable with.  I either buy Top Round or get the Boar's Head London Broil from the deli.  
 
Try this recipe.  I think you will love it.  
 
Balsamic London Broil
 
Ingredients 
 
2 onions, thinly sliced
1 1/2 top round steak (London Broil)
3 tbsp of balsamic vinegar
1.5 tbsp soy sauce
1.5 tbsp mustard
3 cloves garlic, minced
1 tsp pepper
3 sprigs fresh rosemary
 
 
Place onions in a 4 quart slow cooker.  Top with steak, vinegar, soy sauce, mustard, garlic, pepper and rosemary.  Cover and cook on low 6-8 hours or until steak is tender. 
 
Remember right portions and right combinations though.  In the picture we have London Broil, Carrots and Cauliflower Mash.  This should be between 2-6 ounces of London Broil, 1/4 up to 1/2 cup of cauliflower mash and 1/4 cup of carrots.  This is a perfect 1+2+3 and a great fat burning meal.  Very healthy and I hope you will enjoy. 
 
Make your stand.  Eat for the Father, the Son and the Holy Spirit.  
 
Get lean in 2016 so you can remain lean in 17.