Spicy Sweet-and-Sour Grilled Chicken

INGREDIENTS

• 1 cup water
• 1/4 cup plus 2 tablespoons tomato paste (from a 6-ounce can)
• 1 cup soy sauce
• 1 cup distilled white vinegar
• 3/4 cup sugar
• 3/4 cup minced onion (about 1 medium)
• 1/3 cup minced serrano or jalapeño chiles with seeds
• 1/4 cup minced garlic (about 9 large cloves)
• 6 large chicken drumsticks (about 1 1/2 pounds)
• 6 large chicken thighs (about 2 pounds), trimmed of any excess fat and skin
• Lime wedges for serving
• Instant-read thermometer