Pre-heat oven to 150C. Wrap garlic in foil and bake for 1 hour or until soft and golden.
Pass garlic flesh through a course sieve.
Turn oven up to 180C.
Grate rind of lemon and combine with garlic and liquid smoke in a medium bowl.
Place a lemon inside each chicken cavity.
Use your hands to carefully separate chicken skin from breast and leg meat.
Push garlic mix under skin.
Place chickens in a baking tray, season, drizzle with olive oil and bake for 1 hour or until golden and legs are cooked trough. Rest in a warm place for 20 minutes before carving and serving.
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