Once green beans are cleaned and snapped, blanch them in boiling water for about 30 seconds. Remove and put directly into ice water, then drain.
Melt 3 T. butter in pan and add onion and garlic (pressed through a garlic press). Cook until transluscent. Add green beans and wine as well as salt and pepper. Add the last of the butter and cook until liquid reduces (usually a few minutes or so). Serve and enjoy.