Coarsely chop the chocolate and place in a heatproof bowl. Set over, not in, barely simmering water. Heat, stirring from time to time, until the chocolate is just melted and smooth; the chocolate should be warm, not hot. Remove from the heat. (Chocolate could also be slowly melted in the microwave.) Line a baking tray with parchment. Dip a piece of the fruit half way into the chocolate, remove and let the excess drip away. Set on the tray; repeat with the remaining fruit. Set in fridge to set the chocolate.