Mash the garlic cloves in a mortar, add the peppers and mash them into small pieces. Add the coriander and mash a smooth mixture. Stir in the fish sauce, sugar, lime juice and 1 tablespoon of water until the sugar has dissolved. It must be sour, salty, and spicy. Serve in a small bowl with grilled or steamed seafood. You can also put the sauce in a sterilized pot up to 1 cm below the rim, turn the lid on and store it in the fridge for up to 2 weeks.