This is one of those recipes you'll get repeated requests for. It's one of the few things my husband begs me to make! It is great for potlucks or home and doesn't spoil in the refrigerator or on a picnic table due to the vinegar.
Mix the sugar, vinegar, oil & salt mix to blend. As soon as the onion is sliced (I use a mandolin or food processor) mix into the wet ingredients to keep the onion from smelling bad as the vinegar neutralizes the action.
Thin slice the pepper (discarding the stem and seeds). Add to the mixture and continue by adding all the beans. Put in tightly covered storage dish and refrigerate over night.