What is a burger called when its made of mutton instead beef starting with L?

There isn't a widely recognized name for a mutton burger starting with "L."

Here are some options you could consider:

* Lamb Burger: This is the most straightforward and common name.

* Le Burger d'Agneau: A French name that translates to "The Lamb Burger."

* L'Agneau Burger: Another French option, similar to the previous one.

Ultimately, the best name will depend on your personal preference and the context. You could even invent your own name for the burger!