Greek-style barbecued chicken

Put on a Greek feast to share with the whole family with this lemon-and-herb barbecued chicken, cheesy polenta and feta-topped tomato and olive salad.   Ingredients (serves 8): 2 x 1.3kg whole fresh chickens 2 small red onions, coarsely grated 2 bunches fresh oregano, leaves picked, chopped 2 tbs finely grated lemon rind 4 garlic cloves,…