In a small bowl, pour the bourbon over the raisins and let soak for 1-2 hours. If you don't want to use alcohol, skip soaking the raisins.
Preheat the oven to 350 degrees F. Use the melted vegan butter to coat the bottom of a 9x13 inch casserole dish.
Place the pieces of bread in the buttered baking dish. Set aside.
In a blender, add the coconut milk, silken tofu, cornstarch, sugar, vanilla, allspice and cinnamon. Blend until smooth.
Pour the creamy mixture over the bread in the baking dish, and add the bourbon raisins. Stir gently in the dish.
Place in the oven and bake for 40-50 minutes, until the liquid has set and the edges are getting a bit brown.
Let it cool while you make the sauce.
Sauce - Combine the vegan butter, sugar and milk in a small saucepan. Cook over medium heat until the sugar dissolves and the butter has melted. Slowly stir in the bourbon and cook for a few more minutes (or leave it out for alcohol free). Serve warm, drizzled over the bread pudding.