All of them are sandwiches. The last two aren’t burgers. The term burger has shifted a bit over the years, but for the most part it still retains the assumption that it is made of beef and circular. A square piece of beef like the chain Wendy’s does is still a burger, but a swuare piece of fish would but be unless somebody has a rather loose take on what’s. Burger is.

For example, I’m vegan and don’t call grilled tofu slices between circular buns a burger. I would call it a tofu sandwich. If it was a circular piece of grilled tofu, that would be “close enough” to burger.

Shape, cooking method for the protein, and the “caps” that the buns usually serve as are all factors in how much something fits the ideal of “burger”.

For example: a grilled, circular patty served in between two small corn tortillas could be called a tortilla burger, but wrap the patty in a single larger tortilla and it’s not a burger. It’s now a wrap.

Something I should probably add: put damn near anything on a piece of bread it’s an open face sandwich. Put a k the piece on top it’s just a sandwich. Wrap it something it’s a wrap. A grilled patty wrapped in lettuce would be a lettuce wrap. Two chonky pieces of lettuce above and below, and many people would call it a lettuce wrap still but due to the lack of wrapping it would be a sandwich. The use of bread isn’t required for sandwich functionality. Side note: is there a term for the role the buns fill? What do we call the absorbent thing that allows your hands to stay relatively clean while you eating the things placed between them?

I’m too fucking American, I’ve put more effort into this than anything else I’ve posted today lol.