Remove the top and bottom of the leek and cut them into thin slices/strips.

Bake them in the oven for about an hour at 190 degrees Celsius (374 degrees Fahrenheit) (convection). Turn them occasionally if needed. It may take 10 minutes less or more. The goal is for all the leek to turn black.

Grind the pieces of the burnt leek in a mini chopper, coffee grinder, or mortar.

Sieve them through a colander, and they are ready to use.

We typically use them to roll carrots or fish/shellfish in them. It looks nice and gives an aftertaste of leek.