Get your grill nice and hot.

In a large bowl, mix the lamb, lean beef, onion, garlic, cumin, sumac, salt, pepper, parsley and chili pepper.

Remove a handful of the mixture and form the kebabs on skewers. If you don't have skewers, form the kebabs into round patties, about half the diameter of a typical hamburger, although a bit thicker.

Grill the meat and veggies to your desired done-ness.

Build the platter by scattering the veggies evenly and placing the kebabs on top. With so many colors, it looks beautiful.