Preheat your oven to 400°F (200°C). Wrap the beets individually in foil and roast for 45–60 minutes until tender.
Let them cool slightly, then rub off the skins with your hands or a paper towel.
Slice the beets into wedges or rounds, depending on your mood.
To make the vinaigrette, whisk together orange zest and juice, olive oil, mustard, honey, salt, and pepper until smooth.
Arrange salad greens on a platter. Top with beets, orange slices, onion, nuts, and cheese if using.
Drizzle with citrus vinaigrette and serve immediately. Or stare at it first—it’s really that pretty.