Partially peel cucumbers lengthwise, leaving thin green stripes around cucumbers; halve cucumbers lengthwise. Scoop seeds from cucumber halves with a spoon; discard seeds. Thinly slice cucumbers; transfer to a bowl. Add salt to cucumbers; mix with your hands until cucumbers are limp. Set aside for 45 minutes.
Transfer cucumbers to a strainer; squeeze as much liquid out as possible.
Combine lemon juice, sugar, and vinegar in a large bowl until sugar dissolves. Add cucumbers; toss to coat. Divide cucumbers among small bowls; top with sesame seeds.
Japanese Cucumber Salad (Sunomono) Recipe · Dinner Match Lab | Dinner Match Lab