Adding salt to cucumber slices can help to draw out the extra moisture in the vegetable (through a process called osmosis). To do this, simply toss your sliced cucumber with a pinch or two of salt. Place the salted cucumber slices in a colander or strainer for 20-30 minutes to release water. Most of the excess salt will flow off with the liquid, but if desired, rinse the cucumber with cold water before tossing into your salad.