Sounds like you actually got a "Big Twin" pawned off to you as a Big Shef"
The Big Twin" only had a 2-piece bun with shredded lettuce but a sweeter thousand island type sauce that was a little more tomato-ey. Almost liked they added extra ketchup to your run-of-the-mill thousand island dressing.
I agree with Mr King.net, Just because Hardees purchased the Burger Chef Brand name dose not give them carte blanch to play around with the true originals as they wish.
Does anyone remember the early Hardees Whopper near-clone that did not come standard with ketchup?
The name escapes me now but remember they were pretty good.
The air-charcoal grill gave them a unique flavor and without the ketchup the mayo-onion-pickle flavor really came through well.
I actually prefered them to the Whopper back then.