Wash the lime hot, grate dry and cut the peel into thin strips with a zest ripper. Bring 1 tablespoon of water and 1 tablespoon of sugar to the boil. Add the zest, bring to the boil briefly, remove from the syrup and allow to drain. Coarsely chop ginger
Chop the couverture and, except for 4 tablespoons, melt over a warm water bath. Remove the liquid chocolate coating from the water bath, add the remaining chocolate coating and melt while stirring. Pour the couverture into a flat mould lined with cling film (approx. 20 x 15 cm). Spread lime zests and ginger on top, pressing in lightly. Put in a cool place for the feast
Waiting time approx. 1 hour