Brush the cut sides of the bread and the eggplant slices with 2 tablespoons of the oil. Sprinkle eggplant with 1/2 teaspoon salt and 1/4 teaspoon pepper.Advertisement
For a gas or charcoal grill, grill the eggplant slices on the rack of a covered grill directly over medium heat for 5 to 7 minutes or until tender, turning once. Remove to a cutting board and set aside. Grill the bread, cut sides down, for 2 to 3 minutes or until toasted. Cool slightly. Rub bread with cut sides of garlic. Cut bread into bite-size pieces. Place bread and eggplant in a large salad bowl.
Add arugula, cherry tomatoes, mozzarella, tarragon, remaining oil, and vinegar to bowl. Toss all together. Season to taste with additional salt and pepper.
Japanese eggplants have a narrow, straight shape and a tender, slightly sweet flesh. You can substitute regular eggplant in this dish as well as zucchini or yellow squash.