1.   Combine all ingredients in a nonreactive container.

2.   Place the beets, shelled eggs and onion slices, if using, in a large glass or other nonreactive container.

3.   Place the skewers in a shallow nonreactive container and pour in the marinade.

4.   Pour the sauce into a nonreactive container, and refrigerate until it is needed.

5.   Place the beans upright in a nonreactive container with a tight-fitting lid.

6.   Store in a covered nonreactive container in the refrigerator until ready to serve.