Clean, wash and cut the chilli pepper and remove the seeds. Wash tarragon, dab dry and remove coarse stalks. Pour bay leaf, tarragon and chilli into a bottle. Fill up with olive oil so that everything is covered and leave to stand for 3-4 weeks
Tip: It is quicker if you place half of the prepared bottle in a pot of water and keep it warm for 30-40 minutes shortly before boiling