Curried Lentil Salad

Bring water to boil in large pot over high heat. Add lentils; cook 2 minutes. Turn off heat; let stand 5 minutes (lentils will be just tender but still firm to bite). Drain; rinse under cold running water until lentils are completely cool. Drain well. Mix onions, currants, parsley, and capers in large bowl. Mix in lentils.

Purée vinegar and next 12 ingredients in blender until smooth. With blender running, gradually add oil; blend well. Pour dressing over lentil mixture; toss to combine. Season with salt and pepper. Cover and refrigerate at least 30 minutes and up to 4 hours. Divide spinach among plates. Top with lentil salad and serve.