Image credit to: Boston Organics
Cut each cucumber crosswise into three equal lengths. Place pieces in large ziploc bag and smash using a rolling pin or small heavy skillet, so that cucumber sections split into craggy spears. Tear spears into smaller chunks and place in a colander. Toss with salt and let stand 15-30 minutes.
Meanwhile, whisk garlic and vinegar together and let stand a few minutes. Whisk soy sauce, oil, sugar and pepper flakes into vinegar mixture. Drain cucumbers well and transfer to bowl. Add dressing and sesame seeds and toss to combine.