In a pot, cook the onions in the oil until soft and translucent. Add the garlic, lemongrass, ginger and tomato paste. Cook for 5 minutes and add the remaining ingredients. Cover with a cartouche (paper or silicone lid) and cook over low heat for 20 minutes.
Transfer the contents of the pot to a Thermomix jug and blend on high speed until a paste forms. Remove from the blender and refrigerate until needed.
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