For Vinaigrette:

• 2 tablespoons Dijon mustard
• 1/2 teaspoon kosher salt
• 1/4 teaspoon freshly cracked black pepper
• 6 tablespoons olive oil

For Vegetables:

• 1 head garlic, cloves peeled and smashed
• 5 medium red potatoes (about 1 pound), diced into 1 1/2-inch to 2-inch pieces
• 2 medium sweet potatoes, diced into 1 1/2-inch to 2-inch pieces
• 1 white onion, diced into 1 1/2-inch to 2-inch pieces
• 1 turnip, diced into 1 1/2-inch to 2-inch pieces
• 1 pound parsnips, diced into 1 1/2-inch to 2-inch pieces
• 10 sprigs fresh thyme

For Chicken:

• 1 whole (5-6 pound) chicken
• Kosher salt and freshly cracked black pepper