Grilled ratatouille with tomato ragout

Name: Grilled ratatouille with tomato ragout
Ingredients: 1 large eggplant, cut into 1/2 inch rounds; 2 large summer squashes, halved; 2 red bell peppers, seeded and quartered; 1 red onion, cut into 1/2 inch rounds widthwise; 1/4 cup olive oil, plus additional for grilling the vegetables; Salt and pepper, to taste; 3 garlic cloves, finely chopped; 1 tablespoon tomato paste; 10 large cherry tomatoes; 1 cup vegetable stock; 3 tablespoons fresh basil leaves, coarsely chopped; 3 tablespoons fresh parsley leaves, coarsely chopped