Pomelos are everywhere in Thailand . There are 2-3 varieties , the export type are Tongdee and Red Ruby Pomelo(Som O Tub Tim Siam), Thai Pomelo are round green and shiny skin not yellow.
Tongdee Pomelo the flesh is tinged pink and the flavor is sweet juicy and shiny.
Red Ruby Pomelo (Som O Tub Tim Siam), pomelo has deep red flesh, no bitter taste .