1. Heat 1 Tbsp oil in a large skillet over medium heat. Season the chicken with ½ tsp each salt and pepper and cook until golden brown and cooked through, 8 to 10 minutes per side. Remove from heat and add the vinegar. Turn the chicken to coat.

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2. Meanwhile, in a large bowl, toss the scallions, apple, celery, lemon juice, remaining 2 Tbsp oil, ½ tsp salt and ¼ tsp pepper. Fold in the lentils, spinach and parsley (if using). Serve with the chicken.