Steam green beans until beans are just tender.

Cook bacon until lightly browned in large skillet.  Remove bacon; reserve dripping.  Crumble bacon when cool.  Add onions to bacon drippings.  Cook until tender but not browned, about 3 to 4 minutes. 

Add corn syrup, salt, lemon juice and 1-1/2 cups water.  Bring to a boil.  Combine corn starch and cold water in a small bowl; whisk into sauce.  Cook for 1 minute after sauce comes to a boil.  Stir in bacon.

Pour sauce over green beans.  Toss to mix well; serve immediately.