I've already used my green beans and radishes (in nothing terribly exciting so the details will have to wait for the wrap-up), but if you haven't used them or your collards, you might want to try a recipe I found that calls for all three. It's Sinigang na Manok, a Filipino dish of chicken in a sour soup. Here are a couple typical recipes. One substitutes in lemon for the traditional tamarind. I wouldn't do that, personally; The tamarind is the main flavoring. This page has another variation along with some interesting background information and advice.
If you do try it, do please let me know how it goes.