Pollo alla Birra | Mama's Cooking

Ingredients

• 2 skinless chicken leg quarters
• 1 large clove garlic, crushed
• 2 tablespoons dried rosemary, divided in half
• salt, to taste
• ground pepper, to taste
• 1 cup beer
• 3 tablespoons cornstarch
• 3 tablespoons olive oil
• 1 medium yellow onion, halved and cut into 1/4-inch-thick slices