Grapes add polyphenol antioxidants, while the seeds and oil deliver vitamin E.
Combine vinegar, honey, syrup, and mustard in a small bowl. Gradually add oil, stirring with a whisk.
Combine arugula, grapes, seeds, and thyme in a large bowl. Drizzle vinegar mixture over arugula; sprinkle with salt and pepper. Toss gently to coat.
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