Set aside 1/2 cup of beets and 1/4 cup of carrots for the sauce.
Place the remaining beets and carrots on a foil-lined baking sheet.
Drizzle them with 1 tablespoon of olive oil, sprinkle with salt, and toss to coat.
Cover the vegetables with more foil and bake until they are tender, which usually takes about 1 hour.
While the vegetables are roasting, add the reserved beets and carrots, 1/3 cup of grapefruit juice, lemon juice, red wine vinegar, honey, ground ginger, soy sauce, and the remaining tablespoon of olive oil to a blender.
Blend on high speed until the sauce becomes smooth, which takes about 2 minutes.
Once the vegetables are done roasting, drizzle the sauce over them.
Add the grapefruit sections, toss to coat, and garnish with chopped fresh parsley.
Enjoy your Citrus-Ginger Roasted Beets and Carrots with this zesty sauce!