Preheat oven to 400°. Peel sweet potatoes, and cut into 3/4-inch cubes. Peel parsnips, and cut into 1/2-inch slices. Peel beets, and cut into 1/2-inch-thick wedges.
Toss sweet potatoes and parsnips with 2 Tbsp. olive oil in a large bowl; place in a single layer in a lightly greased 15- x 10-inch jelly-roll pan. Sprinkle with 1 1/4 tsp. salt and 1/2 tsp. pepper.
Toss beets with remaining 1 Tbsp. olive oil; arrange beets in a single layer on a separate aluminum foil-lined 15- x 10-inch jelly-roll pan. Sprinkle with remaining 1/2 tsp. salt and 1/2 tsp. pepper.
Bake at 400° for 40 to 45 minutes or just until tender. Let cool completely (about 20 minutes).
Meanwhile, whisk together dressing and next 3 ingredients. Place vegetables in a large bowl, and drizzle with desired amount of dressing; toss gently to coat. Serve at room temperature or chilled over arugula with any remaining dressing.
I served this as the salad for our Christmas dinner. I roasted the vegetables the night before and then refrigerated. I made the dressing Christmas morning and refrigerated. It was absolutely delicious, and so nice to be able to prepare it ahead. I followed the recipe exactly. It was delicious, very pretty, and got rave reviews.
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