Melt the chocolate in a bowl over simmering water, being careful not to over heat.
Whisk the eggs in a bowl over boiling water for a few minutes until light and fluffy.
In a small bowl, lightly whisk the cream. In a separate bowl, quickly whisk the chocolate into the eggs, and add the rum, lime juice, zest & chopped cranberries. Stir to combine and then pour in the cream.
Pour into individual ramekins and place in the refrigerator.
Refrigerate until set and serve.