Add beans and pineapple to slow cooker insert.TIP: I like to drain the thinner liquid on the top of the beans off, however, if you like more sauce for your baked beans, do not drain them before adding them to the slow cooker.
Next, add kielbasa and onion.TIP: Want to try something different? You can also find different flavored sausages on the market that contain pineapple which would also be a great substitute!
Add mustard, brown sugar, ketchup and steak sauce to slow cooker insert.
Stir together to combine. Cook on LOW for four hours. TIP: If you'd like to reduce the sauce further, remove lid and cook on HIGH for 30 minutes before serving.