Chicken Salad with Tomatoes, Black Beans and Cilantro

INGREDIENTS

• 1 white onion
• 1/4 bunch fresh cilantro
• 2 bone-in, skin-on chicken breast halves, each about 3/4 lb.
• 2 garlic cloves, crushed, plus 1 garlic clove, minced
• 1 1/2 tsp. kosher salt, plus more, to taste
• 2 Tbs. fresh lime juice
• 1 jalapeño chili, seeded and minced
• 1/4 tsp. freshly ground pepper, plus more, to taste
• 1/3 cup extra-virgin olive oil
• 2 heirloom tomatoes, preferably 1 red and 1 yellow or green, seeded and cut into 1/2-inch dice
• 1 cup canned black beans, drained and rinsed
• 1 head butter or Bibb lettuce, separated into leaves