In a medium bowl, whisk together the white wine vinegar, garlic, chopped herbs, red pepper flakes, 1/4 teaspoon of salt, black pepper, and olive oil until combined.

Add the sliced zucchini and red onion, then toss to combine.

Let them marinate for 20-30 minutes, or up to 1 hour at room temperature.

After they've sat, taste and season with additional salt if needed.

Store in a sealed container in the fridge for up to 1 week.