Finely chop the onion using a food processor until it reaches a fine consistency, about 30 seconds. Squeeze out excess moisture and return dried onions to the food processor.

Add minced garlic, dried oregano, cumin, dill, salt, pepper, and olive oil to the food processor with the onions. Pulse until well blended into a smooth paste.

In a large bowl, combine ground beef and lamb. Gradually add the aromatic mixture and gently mix until just combined.

Lightly grease a loaf pan with cooking oil and transfer the meat mixture into the pan, pressing down evenly.

Preheat the oven to 350°F (175°C). Bake the meatloaf for about 1 hour or until the internal temperature reaches 165°F (74°C).

Remove the meatloaf from the oven and let it rest in the pan for 10 minutes.

Run a knife around the edges and invert onto a cutting board. Slice and serve warm with pita bread and tzatziki.