Using POST within another form (i.e. "sub-forms")

Rails philosophy encourages the use of POST when dealing with destructive actions. How does one do this when the link to the action is within another form?

In my example, I have an edit form that includes the entry's associated models.

I want to be able to delete these items within the form.

However, HTML doesn't allow for nested forms, so how should I post the request? I could easily use a normal link to do a GET request, but this doesn't seem to fit with "the right way."

How do you do it?