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In a large saucepan or stockpot, saute the onion and garlic in the oil til onion starts to soften, toss in eggplant, zucchini, and bell pepper. Stir and cook for 5 minutes more.
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Add tomatoes with juice, basil, thyme, stock, cayenne pepper, salt, and black pepper.
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Stir and bring to a boil, then reduce heat and simmer for 15-20 minutes.
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If serving soup chunky, it's ready to ladle into bowls. If you desire a smoother soup, puree solids in a blender, combine, then serve. Sprinkle balsamic vinegar over each dish and top with fresh basil.
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Serve it hot, or chill and serve it cold.