This is a totally different way to approach winter vegetables. Rather than lettuce, I like to use all the root vegetables that are in season right now, brighten them up, and create a vibrant, textural salad.
For the vinaigrette: In a jar with a tight-fitting lid (such as a Mason jar), add vinegar, lemon juice, grapefruit juice, honey, and mustard. Use a Microplane to grate the garlic into the vinaigrette, followed by half of the lemon zest. Season with salt and pepper and shake. Leaving some space in the jar, add olive oil and shake again to emulsify. Set aside.
Prepare the artichoke: Break off the exterior leaves to access the tender leaves. Using a paring knife, trim the stem, then "turn the artichoke" by placing it upside down. Cut around the base, removing the bitter green outer part in a circular motion. Continue cutting to get to the choke; then, starting at the bottom of the stem, cut in an upward motion. Finally, quarter the trimmed artichoke and cut out the remaining choke. (Chef's tip: Dip the artichoke in water acidulated with lemon juice to prevent browning.) Set aside.
For the salad: Cut the kohlrabi in half and slice on a mandolin. Trim the tops of the beets and slice on the mandolin, followed by the radish and the artichoke. Cut around the core of the apple to yield four pieces, and slice. Gently toss everything in a bowl and season with salt and pepper. Pour several tablespoons of dressing over the salad and toss again. Store extra vinaigrette in the fridge. Garnish with torn fresh basil and mint. Plate and finish with remaining lemon zest and another drizzle of vinaigrette.