Leftover turkey burger with fig ketchup recipe

Ingredients

• 2 turkey legs
• 1 pinch sea salt
• 1 handful thyme, some for confit, the rest for rosti
• 1.5 kg duck fat
• 1 lemon
• 1 tsp fennel seeds
• 2 bay leaves
• 1 tsp truffle paste
• 3 cloves of garlic, crushed
• 5 tbsp mayonaise
• 6 brioche burger buns, toasted
• 6 duck or chicken eggs
• 4 large potatoes, washed and grated
• 100 g walnuts, crushed