The laver is cooked in batches either continuously for
3-4 hours at a temperature greater than 98 ̊ C or at a lower temperature of 80 ̊C for
up to 9 hours.
Alternatively very small quantities of laver can be cooked in a pressure cooker for 20 minutes or until a core temperature of 85 ̊C is achieved. Cooking time may vary throughout the year, with the younger more succulent laver gathered in the spring often requiring a shorter cooking period.
The exact cooking time required is a skill based on the experience of the “Welsh Laverbread” processor.