1. Heat half the oil in a large sauté pan over medium-high heat. When oil is hot, add zucchini in batches and sauté until lightly browned, about three minutes. Remove from pan and continue with remaining zucchini. (Alternatively, you can also broil the zucchini instead of frying it; instructions below.)
2. In a medium bowl, stir mint, basil, parsley, vinegar, salt, and pepper. Whisk in the remaining quarter cup of oil. Add warm or room-temperature zucchini. Marinate for at least a few minutes or up to two days. Serve over a bed of arugula.
Variations: To broil, preheat broiler and place oven rack on top level, approximately four inches from flame. Toss zucchini in three tablespoons oil. Spread on baking sheet in a single layer. Broil for five minutes or until browned.