If I'm not handing this straight round at a party or with coffee after dinner, I might keep half in my freezer, and put the other half in a box or two for Christmas presents. Make sure they stay cold, though.
Place the chopped chocolate, condensed milk, butter and salt into a heavy-based pan over a low heat and stir until melted and well combined.
Place the nuts into a freezer bag and bash them with a rolling pin, until broken up into some large and some small pieces.
Add the nuts to the melted chocolate mixture and stir well.
Pour the mixture into a 23cm/9in square tray, smoothing the top with a wet palette knife.
Let the fudge cool, then refrigerate until set.
Cut into small pieces approximately 3cm x 2cm/1¼in x ¾in. Cutting 7 x 7 lines in the tin to give 64 pieces best achieves this.
Once cut, the fudge can be kept in the freezer - there's no need to thaw, just eat straight away.
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