Grilled Chicken With Za’atar - Kosher Everyday

Ingredients

• 2 heads garlic, top third cut off
• 6 tablespoons olive oil, divided
• 1 3-4 pound chicken, cut in half lengthwise, backbone removed
• 1/4 cup za'atar
• 1 1/2 teaspoons lemon zest
• 3 tablespoons fresh lemon juice
• 1 tablespoon fresh rosemary, chopped
• 1 small Serrano chile, seeded, minced
• 2 teaspoons dried marjoram
• Kosher salt
• Freshly ground black pepper