Ingredients:Viet style:1kg beef tendon200g sugar200ml fish sauce200ml water100ml vinegar60g lemongrass10g ginger2 bird-eye chilis2 chili peppers4 garlic cloves70g scallion heads100g kumquat2-3 green peppercornsThai style:1kg beef tendon200g sugar200ml fish sauce200ml water100g chili peppers30g bird-eye chilis100g galangal100g lemongrass (white part only)20g cilantro root50g garlic50g shallot5 kumquats10 lime leaves