Marinate meat for several hours in 1:1 teriyaki-soy sauce mixture. Keep in cool area.
Lightly flour meat. Brown floured meat in olive oil.
Add Cajun spice and pepper to meat to taste.
Place a layer of meat in the bottom of a slow cooker, followed by a layer of slice onion and a layer of cream of mushroom soup topped with finely chopped garlic. Repeat this sequence until all the meat is in the slow cooker.
Add a cup of water and set the temperature control to Medium.