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Using a whisk, mash the raspberries with the vinegar in a medium bowl.
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Slowly add 3 tablespoons of the grapeseed oil and the extra-virgin olive oil, whisking constantly until the mixture is well blended. Mix in the chives and season the vinaigrette to taste with salt and pepper.
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Season the chicken tenders with salt and pepper and coat with the sesame seeds.
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Heat 1 tablespoon of the grapeseed oil in a large non-stick sauté pan over medium-high heat. Add half of the sesame-coated chicken tenders and cook for about 2 minutes on each side, or until just cooked through and golden brown. Transfer the chicken to paper towels to drain any excess oil. Repeat with the remaining 1 tablespoon grapeseed oil and chicken tenders.
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Toss the spinach leaves, tomatoes, and mango together in a large bowl with enough vinaigrette to coat.
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Season the salad to taste with salt and pepper.
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Divide the salad among 4 large serving plates. Cut each chicken tender on a diagonal into 4 slices.
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Arrange the chicken slices over the salads, drizzle with more dressing and serve.