Today's adaptable quinoa salad, easy to change up. It works as a main dish salad but a side salad too. It has a triple dose of protein, quinoa plus black beans plus still more from the tangy feta. That makes the salad extra-filling and satisfying, even a half cup at a time. This is a useful "concept recipe" just by swapping out beans and seasonal vegetables and even cheeses. Here I've used late-summer vegetables but it's easy to imagine spring and summer versions too.