In the deep South folks feel pretty strongly about their black-eyed peas! In fact, they love them so much that they even make a salad out of them! In a pinch, you can also make this dish with good-quality canned black-eyed peas. Just drain, measure, and replace them in the recipe.
If you have a variety of beets at your local farmer's market feel free to use as many varieties as you like. The same is true of mache. If it is not available, use any type of soft green such as bibb lettuce, sunflower sprouts, or an herb mix.
Panzanella is a Tuscan bread salad. It is almost always made with fresh tomatoes and mozzarella but from there you can kick it up as much as you like. Go ahead and throw in olives, roasted peppers or cucumbers or even add some sliced Italian salami.