Brown rice makes a nutty, chewy base for this salad and is a nice foil for sweet grapes and fresh greens. Using frozen precooked rice makes the whole dish doable in 15 minutes. The creamy dressing comes together quickly in the blender.
Put the frozen rice in a medium glass mixing bowl, and break it up using a fork. Drape a damp paper towel directly over the rice, and microwave until the rice is warmed through and softened, 2 to 3 minutes.
Meanwhile, puree the yogurt, oil, lemon zest and juice, mayonnaise, shallots, garlic, 1 1/2 teaspoons salt and a few grinds of pepper in a small food processor or a blender until smooth. Toast the walnuts in a small skillet over medium heat until fragrant and just starting to brown, about 2 minutes.
Combine the chicken, grapes, parsley and spinach in a large bowl, and toss with half the dressing. Add the warmed rice and toasted walnuts, toss again and serve with the remaining dressing.
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