Tea Smoked Duck With Smoked Walnuts

• 12 walnuts unshelled (whole)
• 6 scallions
• 2 1/2 chinese black tea
• 1 five-spice powder
• 1 duckling (whole)
• 1/2 hickory chips
• 700 ml water
• 110 gr brown sugar packed
• 60 ml soy sauce
• 18 gr szechuan peppercorns (toasted)