Step 1Heat oil in large skillet over medium heat. Add garlic and celery and cook, stirring until garlic is fragrant, about 3 to 4 minutes.
Step 2Add tomato, raise heat to medium high and cook until tomato has released its juices, about 5 minutes. Add onion, eggplant, bell pepper, capers and olives. Cook until heated through, about 10 minutes.
Step 3Remove from heat and stir in parsley and vinegar. Season to taste with salt and pepper. Serve with grilled chicken breasts.