Trotter and ginger in sweetened black vinegar ????

Pig trotter and ginger stewed in sweet black vinegar is an old traditional Cantonese recipe originally formulated for mothers after birth, to keep new mums warm during the first month after birth. Also many Cantonese families who has new baby will cook a shed load of this, together with some red coloured hard boiled eggs in their shells and some some chicken cooked in homemade rice wine, all