At Driftaway, we host three types of comparative coffee tastings: Weekly Saturday tastings with the Explorer Box, 90 minute Private tastings , and Corporate tastings. For all three, we taste the coffees in the professional, or cupping style.
For this method, each coffee is steeped in a mug, side by side, so that we can taste each one at the same temperature and compare.
The best grind size for this type of tasting is medium - what you'd use for a pour over or electric drip. It should look a little finer than sea salt: