01 - Preheat the oven to 400°F. Wrap each beet individually in aluminum foil and arrange them on a baking sheet.
02 - Roast the wrapped beets for 40 to 50 minutes, until a knife slides in easily. Allow to cool, then peel and slice into wedges.
03 - Combine olive oil, red wine vinegar, honey, Dijon mustard, salt, and pepper in a small bowl. Whisk until emulsified.
04 - In a large bowl, mix the salad greens, roasted beet wedges, and sliced red onion.
05 - Drizzle the dressing over the salad and toss gently to coat all ingredients evenly.
06 - Sprinkle crumbled feta and toasted nuts on top just before serving.