Ensure grill grates are clean and bring grill up to medium-high heat.
In a large bowl combine the Lamb Burger ingredients. Stir to combine.
Divide into 4 equal balls and then gently flatten into patties.
Press down in the center of each patty with your thumb to create an indent.
Place patties over direct heat for 6 minutes.
Flip and let cook an additional 6 minutes or until burgers have reached an internal temperature of 145 degrees F.
Remove from grill and let rest 5 minutes.
Create Burger: place the bottom half of a burger bun on a plate. Add lettuce followed by the some tzatziki sauce, lamb burger, sliced red onion, tomato and the more tzatziki sauce and feta cheese. Place top of hamburger bun on top and enjoy!
Notes
Gluten-Free: use almond flour and a gluten-free hamburger bun to make this recipe gluten-free.
Dairy-Free: use dairy-free tzatziki and dairy-free feta cheese to make this recipe dairy-free.
Make ahead: feel free to make the patties the day before. Store in an airtight container in the refrigerator.
Freeze: to make these ahead and freeze simply make patties and then place a piece of parchment between them as you stack. Place in a freezer-safe bag, label and place in freezer for up to 3 months. Let thaw overnight and then grill according to the instructions above.