To make the vinaigrette: In a small bowl, whisk together the vinegar, orange juice, Dijon mustard, shallot and garlic. Slowly whisk in the oil until the vinaigrette is emulsified. Season with salt and crushed red pepper to taste and then fold in the herbs. Store in an airtight container and refrigerate until ready to serve.
To make the chopped salad: In a large bowl gently toss together all the ingredients. Season the salad with salt, pepper, dried oregano and crushed red pepper flakes to taste. Dress the salad with the vinaigrette and serve immediately.