Heat a heavy-based frying pan.
Add all the ingredients except the seasoning and cook over a medium heat for about 5 minutes.
Add 1 cup water and bring to the boil.
Reduce the heat and simmer gently for another 10 minutes or until the peppers have softened.
Purée in a blender.
Season and leave to cool.
This will keep in the fridge for 10 days or in the freezer for a month.
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