Chicken Tikka
["1 piece (2-inch) fresh ginger, peeled and coarsely chopped", "6 cloves garlic, coarsely chopped", "4 Tbsp. fresh lemon juice", "1 c. nonfat plain yoghurt", "6 Tbsp. vegetable oil", "2 tsp. chili powder", "2 tsp. salt", "4 whole boneless, skinless chicken breasts (about 12 oz. each, 3 lb. total), halved", "3 medium onions, halved and slivered", "1 tsp. ground cumin", "1/4 tsp. ground turmeric", "2 Tbsp. chopped flat leaf parsley (for garnish)", "3 limes, halved crosswise (for serving)"]
["Place the ginger and garlic, 2 tablespoons lemon juice and 1/4 cup of the yoghurt in a food processor and puree until smooth. Scrape the puree into a bowl with the remaining 3/4 cup yoghurt, 3 tablespoons oil, the chili powder and 1 teaspoon salt.", "Stir well. Cut each halved chicken breast crosswise into 3 pieces.", "Add the chicken to the yoghurt mixture and toss to coat.", "Marinate at room temperature for 1 hour."]
["fresh ginger", "garlic", "lemon juice", "nonfat plain yoghurt", "vegetable oil", "chili powder", "salt", "chicken breasts", "onions", "ground cumin", "ground turmeric", "flat leaf parsley"]