Mix The Ketchup, Italian Dressing, Soy Sauce, And Molasses In A Small Bowl. Place The Steak In Slow Cooker, Sprinkle With Onions, And Pour The Ketchup Mixture Over The Steak. Turn The Slow Cooker To High And Cook For 1 Hour. Reduce The Heat To Low And Continue Cooking Until The Meat Is Tender, About 4 Hours. Serve On Hoagie Buns And Top With 1/4 Cup Coleslaw, If Desired, For A Southern Bbq Flavor.