Chicken, Leek and Apple Stew

Bahan-bahan (4 porsi)

• 2 pounds chicken thighs ((about 8 thighs))
• 1 teaspoon kosher salt ((add additional salt for seasoning, as needed))
• freshly ground black pepper, (to taste)
• 3 tablespoons unsalted butter, (divided)
• 1 tablespoon vegetable or canola oil
• 2 tablespoons all purpose flour ((plus extra, for dredging))
• 3 whole leeks (white and green parts)- (halved lengthwise, sliced into thick half circles, and well rinsed)
• ½ teaspoon celery seeds
• ¼ cup dry white vermouth ((can sub white wine))
• 1 cup chicken broth
• ½ cup apple cider or apple juice
• 4 sprigs fresh thyme
• 2 medium Golden Delicious apples, (cored and diced)