Slice the stale bread rolls into rounds and place them in a large bowl.
Heat the plant-based milk in a saucepan, then add the vanilla extract, cane sugar, and grated lemon zest. Stir until the sugar is completely dissolved.
Pour the warm plant-based milk over the bread roll slices, allowing them to soak well. Gently stir to avoid breaking them up.
In another bowl, combine the ground poppy seeds with the remaining cane sugar. Add the raisins if desired.
Grease a baking dish with plant-based margarine, then layer the bread roll mixture and the poppy seed mixture alternately into the dish.
Preheat the oven to 350°F (180°C) and bake the poppy seed bread pudding for 25-30 minutes, or until the top is golden brown.
Let it cool slightly, then serve sprinkled with powdered sugar or with plant-based vanilla sauce.
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