Q.Growing Coriander for roots
Hi, I would like to grow some large coriander roots like those used in Asian
cooking (soups etc.) Could you please tell me the best way to go about this
and also if there is a cultivar best suited for the job? All of the info I can
find only deals with growing the leaf.
Many thanks. .

I didn't see any information on which coriander seed is better for root seasoning. Many factors affect flavor in the leaves, sun, water, soil, etc and these affect root taste as well. I found an article that may help in the growing and harvesting. Keep in mind that coriander does not like hot weather. It is a "cool season crop" and will bolt when temps reach 80s F. Many of us grow it in the spring and another batch in the fall. http://shesimmers.com/2011/07/how-to-grow-coriander-for-the-roots-to-use-in-thai-cooking.html. While we are on the topic of SE Asian cuisine, take a look at this: https://www.gardeningknowhow.com/edible/herbs/vietnamese-cilantro/vietnamese-cilantro-herbs.htm
Finally, an article with tips on growing cilantro: https://www.gardeningknowhow.com/edible/herbs/cilantro/tips-for-growing-cilantro.htm