Set a heatproof bowl over a saucepan of simmering water, making sure the bowl doesn't touch the water. Roughly chop chocolate and place in the bowl to melt, stirring frequently, keeping the heat very low. Chop toasted nuts; using scissors, cut dried fruit into small pieces. Finely chop candied ginger and/or orange peel. Place fruit and nuts into a large mixing bowl.
Once chocolate is melted and smooth, take it off the heat and stir fruit and nuts into the chocolate. Gently stir to combine so the fruit and nuts are all combined with the chocolate. Line a pan with parchment paper that’s been sprayed with a little oil. Sprinkle cocoa powder over parchment and then add the chocolate mixture. Spread it out in an even layer. Dust with more cocoa powder and place another piece of parchment paper on top. Let it cool down and set in the refrigerator, 1 hour.
When chocolate is set, run a knife around the edge to remove from the pan. Break or cut into pieces to make chunky chocolates.