Start by slicking the vegetables to an even thickness, about ¼" thick. Then saute them in the hot oil until they're soft. This takes about 5 minutes over medium-high heat.
Increase the heat of the burner until the water starts to boil. Reduce heat to allow a low boil or simmer and let it do this for five minutes. Be sure not to over-boil or you'll end up with mushy vegetables.