I made this ham, cheese, tomato, lettuce and mayo on rye sandwich for my hubby’s birthday. It is a 10" banana cake filled with fondant and buttercream.
The beer can in the second pic shows the size comparison and the last pic is showing the inside, and it still looks just like a sandwich cut open.

Our kids thought it was awesome when grandma pointed out that because the toppings were actually in the middle that it was really an “inside out” or more correct an “outside in” cake.