Heat a large frying pan and cook or toast the peanuts till golden. Add the nuts to a food processor and blend with the oil until you have a paste.
Peel and roughly chop the garlic, shallot and lemongrass. De seed the chillis.
Add these to the paste, then add the rest of the ingredients along with water.
Pour the sauce back into the pan used for the nuts and simmer until its reduced to the consistency you require.
«You can use chunky shop bought peanut butter if you wanted to speed things up a little but the flavours quite different.»