Trim and cut washed green beans into bite size pieces
In a skillet bring 2 appx cups of water to boil
Mince onion
Put green beans in boiling water, cook until bright green
Remove immediately, drain, rinse with cold water and put a few ice cubes to stop the beans from cooking
Add minced onion and butter to the skillet and lightly saute
Add the balsamic vinegar, cook on medium heat stirring frequently until the balsamic vinegar thickens This doesn'ttake long
Add cooled green beans to the skillet and toss to coat throughly while heating the beans
When warm enough, serve
