Choose a pink and yellowy kidney with a spongy feel. Cut in half horizontally, and remove the white membrane. Score the outside in 5 or 6 cuts from end to end only ⅓ the thickness of the kidney half. Lay knife almost flat to slice in large thin pieces across the grain. Soak slices in cold water.
Slice unpeeled cucumbers in 2” lengths and sprinkle with ½ teaspoo