Marinated Kebabs (Ina Garten) - cooking recipe

Ingredients

1 lb plain yogurt
1/4 cup olive oil, plus more for brushing grill
1 teaspoon lemon zest
1/4 cup fresh lemon juice (2 lemons)
5 tablespoons fresh rosemary leaves
salt & freshly ground black pepper
2 lbs boneless lamb or 2 lbs top round beef
1 red onion

Preparation

In a large bowl, combine yogurt, olive oil, lemon zest, lemon juice, rosemary, salt to taste, and pepper to taste; add lamb or beef, stir to coat, cover and marinate in the refrigerator overnight or up to 2 days.
Prepare a charcoal grill; if using wooden skewers, soak in water 30 minutes so they do not char.
Cut lamb into 1 1/2 inch cubes, you'll have about 20.
Cut onion into 8 wedges, separating into sections of 3 or 4.
Thread skewers with 3 or 4 pieces of meat alternating with onion sections.
Season both sides with salt and pepper.
Grill, turning 2 or 3 times, until medium rare, about 10 to 15 minutes.