Curried Chicken Salad with Garam Masala Biscuits

Name: Curried Chicken Salad with Garam Masala Biscuits
Ingredients: 1 carrot, coarsely chopped; 1 onion, coarsely chopped; 1 teaspoon black peppercorns; 1 bay leaf; 4 pounds chicken breast halves, on the bone, with skin; 1 cup mayonnaise, plus more for spreading; 1 tablespoon curry powder; 1 tablespoon fresh lime juice; 3 cups red grapes (about 14 ounces), halved; 2 celery ribs, preferably from the heart, finely diced; 2 tablespoons chopped cilantro; 1/4 cup shelled pistachios, toasted (see Note); Salt and freshly ground pepper; Garam Masala Biscuits