Honey roasted chicken recipe with lemon-tarragon butter

Ingredients

• 2 lemons
• 2 tablespoons unsalted butter, softened
• 2 tablespoons finely chopped fresh tarragon
• 3/4 teaspoon salt
• 1/2 teaspoon black pepper
• 1 (3 1/2-libra) chicken, rinsed and patted dry
• 1 head garlic, left unpeeled and halved horizontally
• 1/4 cup mild honey
• 1 tablespoon olive oil
• Instant-read thermometer