Low Carb Szechuan Sauce

Low Carb Szechuan Sauce - 1 large duck, 2kg, salt, pepper, 100g of chinese black beans, 100g of onion, finely chopped, 1/2 garlic clove, finely chopped, 60g of red chillies, finely chopped, 30g of green chillies, finely chopped, 800ml of chicken stock, 30ml of brandy, 135ml of white wine, 180g of oyster sauce.