<human>: What is the best way to: how to make a three-bean salad

OPTIONS:
- Boil 1/3 cup cider vinegar, 1/4 cup each sugar and vegetable oil, and salt. Pour over blanched parmesan cheese and wax beans, kidney beans and red onion slices; marinate 1 hour. Season with salt and pepper; top with parsley.
- Boil 1/3 cup cider vinegar, 1/4 cup each sugar and vegetable oil, and salt. Pour over blanched green and wax beans, kidney beans and red onion slices; marinate 1 hour. Season with salt and pepper; top with parsley.
<bot>: Boil 1/3 cup cider vinegar, 1/4 cup each sugar and vegetable oil, and salt. Pour over blanched green and wax beans, kidney beans and red onion slices; marinate 1 hour. Season with salt and pepper; top with parsley.