Like the colander, in use since ancient times, it is an example of a kitchen technology that has stuck.
Use the back of the spoon to press the eggplant flesh against the side of the colander to remove excess water.
Today I use a colander, like everybody else, or occasionally buy pre-washed collard greens.
mid-14c., coloundour, probably altered from Medieval Latin colatorium "strainer" (with parasitic -n-) from Latin colatus, past participle of colare "to strain," from colum "sieve, strainer, wicker fishing net," of uncertain origin. Cognate with French couloir, Spanish colador, Italian colatojo.