In a large skillet over medium heat, add the oil and onion. Sauté for 5-6 minutes until the onions are soft. Stir in the spinach and cook until wilted. Set aside.
In a large bowl mix together the lamb, egg, almond flour, ¼ cup ketchup, oregano, mint, sea salt, pepper, and onion/spinach mixture. Mix until everything is combined.
If you don’t own a meat thermometer, consider getting one for meatloaf! They are very inexpensive and tell you when the meat is done. No more second-guessing.