Cut all salad ingredients into small pieces, and mix together in a large bowl with the salad greens.
Place the vinegar, lemon juice, mustard, garlic, oregano, pepper, and sugar in a blender or food processor. Blend for 30 seconds. Add salt and pepper to taste. Drizzle in the olive oil; blend.
In a large bowl, drizzle the salad dressing over the salad greens and toss to distribute evenly.