Chocolate mars bar cake icing
Melting a couple of mars bars makes an excellent quick chocolate cake
topping!! However, even if I leave it to go cold before spreading on the
cake, it never truely sets again - what should I add to help it set? I have
resorted to keeping it in the fridge, but surely just adding a magic
ingredient should set it - (have tried a tablespoon of milk per bar and it
doesn't help)
??
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