Place cucumbers on a cutting board and cover with a paper towel or clean kitchen towel. Smash with a meat mallet or heavy pot until they start to break apart. Tear into bite-size pieces and place in a colander; sprinkle with salt and stir. Let stand 10 minutes.
Meanwhile, whisk lemon juice, cumin and pepper in a medium bowl.
Shake the cucumbers in the colander to drain any liquid. Turn the cucumbers out onto a clean kitchen towel and pat dry.
Add the cucumbers to the dressing and toss to coat.