Grilled Chicken and Orange Skewers With Zucchini Rice

cut into 1 1/2-inch pieces 1 1/4 pounds boneless, skinless chicken thighs, boneless skinless

Navel orange, cut into 16 pieces

Red onion, small

Zucchini, medium

White rice, long-grain

Cayenne pepper

Kosher salt and black pepper

Olive oil

Cumin, ground