For the vinaigrette, whisk all the ingredients together in a large (salad-sized) bowl.
Add the cut up tomatoes, red onion, basil, and capers to the dressing bowl. Toss, then salt the tomatoes with an additional ½ teaspoon salt to bring out the juices. Let sit while you prepare the vegetables.
Slice the vegetables about ¼ inch thick on a diagonal. Brush with 1 Tablespoon olive oil and sprinkle with dried oregano, salt & pepper.
Add the bread cubes and fresh mozzarella if using to the salad bowl and toss with the vinaigrette and tomato mixture. Top with the Parmesan shavings.
Grill the eggplant and zucchini for a few minutes on each side, until tender. Add the grilled vegetables and roasted pepper to the salad, or serve alongside and let people combine for themselves.
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Notes
Feel free to use include the vegetables that you have available! Parmesan shavings make a nice additional garnish.
I am not a health professional and nutrition data is calculated programatically. Accuracy may vary with product selection, calculator accuracy, etc. Consult a professional for the best information.