Use dried chillies as a substitute for fresh chillies in cooking. They can be crushed or simply crumbled (with or without the seeds), or soaked and ground into a paste as here.
Spread dried chillies out on a baking sheet and toast them under a hot grill for 3-5 minutes, turning them frequently.
Transfer chillies to a bowl and cover with warm water. Let stand for 1 hour.
Drain the chillies and rind them to a paste in a pestle and mortar, then rub the paste through a sieve to remove the skins.