1Bring a large pot of salted water to a boil over high heat. Blanch asparagus until just tender, drain, and immediately plunge into ice water to stop the cooking process. When the asparagus is cold, drain and slice on the diagonal into 1-inch pieces.
2In a small bowl, stir together tahini, water, lemon juice, and garlic. Stir in sugar to taste.
3Toss together asparagus, red cabbage, radishes, green onions, feta, pine nuts, and dill in a large bowl. Pour in tahini dressing and mix to combine.