Preheat oven to 400F. Lightly coat 3-4 small beets with oil, wrap individually in foil and roast on a baking sheet until tender when pierced with a knife, about 40-50 minutes.
Let cool for 10 minutes, then carefully peel and slice into ¼-inch thick slices.
For dressing:
In a medium bowl, whisk ¼ cup balsamic vinegar with 1 tsp Dijon mustard, 1 tsp honey, ¼ tsp salt and pepper until combined.
While whisking continuously, pour in ½ cup extra virgin olive oil in a steady stream until incorporated and the dressing has thickened, about 30 seconds.
To assemble salad:
In a large bowl, toss ½ head of romaine with 11 oz arugula, ½ head of radicchio, ½ cup cubed feta, ¼ red onion, ½ cup chopped walnuts and roasted beets. Add dressing gradually, tossing to coat, and reserve any extra on the side.
Notes
Wrapping the beets individually in foil helps them cook evenly and makes peeling much easier once roasted.
This salad doesn't hold well once dressed, served it immediately. If prepping in advance, add dressing just before serving.
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