Mix all the ingredients together in a medium sized mixing bowl and form into 4 round patties.
Heat avocado or olive oil in a skillet on medium and begin cooking burgers. Brown on either side. Feel free to add a few spoonfuls of bone broth (or chicken broth) in the skillet to help steam/finish cooking)
Let cook for 5-7 minutes or until fully cooked.
Sauté leeks separately in olive or avocado oil. Season with salt and pepper and toss until caramelized. Serve on top of burgers.