Gently melt the dark chocolate in a bowl over a pan of simmering water (don't allow the bowl to touch the water).
Remove from the heat and stir in the double cream, gin, tonic, lime juice and lime zest. Mix until totally combined and smooth.
Pop into the fridge, uncovered, for 2 hours or overnight.
Remove from the fridge and with clean hands, form into small, walnut sized balls. Place them onto baking paper and pop back into the fridge for 2 hours or freezer for 1 hour.
Meanwhile melt the white chocolate in a bowl over a pan of simmering water.
Remove the truffles from the fridge or freezer and dip to coat in the white chocolate, tapping off any excess.
Allow the chocolate to set totally before serving. Serve the truffles at room temperature.
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