Grilled Italian Panini with Zucchini, Summer Squash & Basil Recipe

medium zucchini

medium yellow squash

red bell peppers, quartered

olive oil

balsamic vinegar

kosher salt

freshly ground pepper

whole wheat ciabatta rolls, cut in half crosswise

tomato sauce (your favorite kind)

fresh mozzarella, thinly sliced

fresh basil leaves, thinly sliced