Place chicken a large Ziploc baggie with 1/3 cup balsamic vinegar, lemon zest and juice, oregano and ½ tsp salt and ¼ tsp black pepper. Seal bag and gently toss (over the sink – yes, I’ve learned the hard way! J) to combine. Marinade for 30 minutes, up to overnight. Pull out of the fridge 30 minutes prior to cooking.