Prepare Whole-Wheat Pizza Dough, if using. To cook pizzas on a charcoal grill, build a medium-hot fire in one half of the grill (two bricks placed end-to-end work well as a divider). For a gas grill with two burners, preheat one burner on high, leaving the other unlit. For a single-burner gas grill, preheat on high, and lower the flame to cook the second side of the pizzas.
Toss eggplant slices with 1 tablespoon oil in a large bowl. Sprinkle the slices with salt and pepper and grill, turning often, until tender, about 8 minutes. Let cool; chop coarsely.
Combine the chopped eggplant with tomatoes, feta cheese, 2 tablespoons mint and the remaining 1 tablespoon oil in a mixing bowl. Season with salt and pepper.
Roll out the pizza dough into 4 circles and place on a floured cutting board. Bring the dough, toppings and a pair of tongs to grillside.
Place 2 of the dough circles on the hot side of the grill. Within 1 minute the dough will puff slightly, and the underside will firm up and be striped with grill marks. Use tongs to flip the crusts over and onto the cooler side of the grill.
Distribute half of the eggplant mixture on the crusts after turning. Cover the grill and cook, rotating the pizzas once or twice, until the toppings are heated through, about 5 minutes.
Remove the pizzas from the grill. Repeat Steps 5 and 6 with the remaining dough and toppings. Just before serving, scatter the remaining 2 tablespoons mint over the pizzas.
I love finding different recipe for the eggplant. This one will not disappoint you. I omitted the mint and didn't miss a thing. I also roasted the eggplants instead of grilling and it came out perfect.