Sautéed Kohlrabi

-Grate 2 kohlrabi, place in colander and sprinkle with salt.  Let stand 30 minutes to drain. 
 -Heat 1TBS butter over medium heat and add 1 medium diced onion.
-Sauté for a few minutes and then stir in kohlrabi, reduce heat to low, cover and cook 10 minutes.