Bull Kelp Salt

• charcoal* and wood*, for burning
• 500 g (1 lb 2 oz) fresh bull kelp

Light a fire with the charcoal and wood. Once the fire has died down, grill the kelp over the fire, about 20 cm (8 inches) above the heat, for 1–2 hours, turning every 10 minutes until it is crisp and perf