Cooking Floyd: Supper Out of a Box

This week's CSA box yielded among other things sweet yellow corn, baby lettuce mix, and vine-ripened tomatoes.  A friend had gifted me with a couple of her sweet purple Cippolini onions.  The volunteer cilantro in my garden just keeps coming on and the Carnival bell peppers are producing.  All of this just screamed Black Bean and Corn Salad!