Basically, you just have a few simple steps:
- Remove the seeds (some or most if you wish)
- Start a pot or tea pot of water to boil.
- Drop the peppers into a hot pan to roast them for just a moment (30 sec to 1 minute per side). Be sure to give them a bit of a pressing down. You could also put a plate on them to give some temporary weight.
- Once roasted, drop them into a bowl. Cover with your boiling water. Allow to steep for about 30 minutes.
- Once they are soft and pliable they are ready for use in whatever manner you wish.
TIP: Depending on what you are using them for you could get away with steeping for 10-20 minutes.