01 -
Slice tomatoes into 1.25 cm thick rounds and arrange in a single layer in a large, shallow dish.
02 -
Combine olive oil, red wine vinegar, chopped red onion, minced garlic, parsley, basil, salt, and black pepper in a jar with a tight-sealing lid. Shake vigorously until blended.
03 -
Pour the marinade evenly over the tomato slices. Cover the dish and allow tomatoes to marinate for 2 to 3 hours at room temperature or refrigerate for 12 to 24 hours for deeper flavor.
04 -
If chilled, bring marinated tomatoes to room temperature before serving. Transfer to individual serving plates, spoon marinade juices over top, and garnish with additional fresh herbs if desired.