Easy Tandoori Chicken

Name: Easy Tandoori Chicken
Ingredients: 8 skinless, boneless chicken thighs (about 2 1/2 pounds); Juice of 1 lemon; Kosher salt; 1/2 cup plus 2 tablespoons plain yogurt; 1 tablespoon vegetable oil; 1/2 small red onion, roughly chopped; 3 cloves garlic, smashed; 1 2 -inch piece ginger, peeled and roughly chopped; 4 teaspoons tomato paste; 2 teaspoons ground coriander; 1 1/2 teaspoons ground cumin; 1 3/4 teaspoons hot paprika; 2 tablespoons chopped fresh cilantro; Cooked rice, for serving (optional)