- In a large mixing bowl, combine minced shallot and grapefruit juice. Set aside for 10 minutes.
- Whisk in olive oil, Greek yogurt, mustard and sugar.
- Season with salt and pepper.
- Add shredded cabbage, supremed grapefruit, avocado and dressing. Toss gently to combine.
- Serve as a side dish with salmon, shrimp or grilled chicken.