Allow the charcoal sit over a direct flame for 30 minutes to an hour. Korin recommends using a binchotan starter pan for convenience.
Fan the charcoal to heat faster.
Please do not burn charcoal indoors, only in well ventilated areas. All types of burning charcoal will produce odorless Carbon Monoxide gas. For best result, keep in cool and dry environments. Damp charcoal may take longer to ignite and may be hazardous.