Prepare steak by cutting into strips
In medium bowl, mix ¼ cup all-purpose flour with salt and pepper
Coat steak strips with flour mixture
Place steak strips in slow cooker alongn with the chopped onion, minced garlic and the strips of green pepper
Stir together
In separate bowl, mix beef base, soy sauce, Worcestershire sauce, and tomatoes
Pour into slow cooker over steak
Ensure the meat is well soaked
Place lid on slow cooker and cook on low for 8 - 12 hours
Approximately an hour before serving, mix in the left over green peppers
Turn heat up to high