Hi,
Great question. The short answer is this is not as easy as it should
be...yet. We are working on a composite food feature that will address
this.
However, in the meantime, it is possible for things you eat all the
time. Here is a link to a video I put together that walks through the
creation of your turkey sandwich. Hope it helps:
http://groups.google.com/group/figwee/web/Figwee%20-%20Adding%20A%20Composite%20Food.wmv
Thanks for the suggestion,
-Jeff