Preheat oven to 325° and line a loaf pan with parchment paper. Set aside.
Quarter and peel the onion and place it in the food processor with the garlic. Pulse until chopped into small pieces.
Add the lamb, beef, cumin, thyme, oregano, rosemary, pepper, and salt.
Process until the mixture is evenly mixed and smooth. You may need to stop and scrap it down between pulses. The mixture will be very pasty looking and feeling.
Press mixture into the loaf pan, pressing it in tightly and evenly.
Bake for 55-60 minutes.
Pour off excess fat that cooks off. I always pour that into a bowl, let it cool, and throw it away.
Let cool on the counter and if possible, place a weight on it while cooling. I like to place another loaf pan on top and place a bag of beans or rice in there. This creates a dense loaf which is ideal for cutting.
Let cool in the fridge over night.
Slice into strips and pan fry in lard or coconut oil. Serve with onion, tomato and Tzatziki sauce.