In a medium bowl, whisk together vinegar, lemon juice, and shallot; let stand for 15 minutes. Whisk in oregano, mustard, and honey until combined. Whisking constantly, gradually add olive oil in a slow, steady stream until mixture is combined. Stir in cheese. Use immediately, or cover and refrigerate for up to 5 days. Whisk before serving.
Recipe by Victoria at https://victoriamag.com/spanakopita-salad-recipe/