Preheat oven to 170 C / Gas 3. Line a baking dish with aluminium foil.
Partially slice each salami into 6mm thick slices, making sure the cuts do not go all the way through. Place the salamis into the prepared baking dish, and bake for 1 hour. Drain off the grease.
Mix the barbecue sauce and dark brown soft sugar together in a bowl, stirring until the sugar is dissolved. Pour about 450ml of the sauce over the salami, and retain the rest for basting. Return the salamis to the oven and bake for 45 minutes more, basting occasionally with the reserved sauce. Serve on a platter with a knife so guests can cut their own slices.