Marinated Grilled Tomatoes

Preheat grill to high (450 degrees F to 500 degrees F). Remove and discard tomato cores. Cut heirloom tomatoes lengthwise into quarters; cut plum tomatoes lengthwise in half. Place tomatoes in a large bowl. Add vinegar, oil, shallot, garlic, salt, pepper and 1/4 cup of the basil; stir until tomatoes are well coated. Let stand 10 minutes.

Place tomatoes, cut sides down, on oiled grates, reserving vinegar-oil mixture in bowl. Grill, covered, until charred, 2 to 3 minutes. Turn tomatoes; grill, uncovered, 1 minute. Transfer to a serving platter; spoon reserved vinegar-oil mixture over tomatoes, and sprinkle with remaining 1/2 cup basil.