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Prepare the barbecue for indirect cooking over medium-low heat (170°C to 190°C).] If you are using a Weber Q barbecue, set up your barbecue with a convection tray and trivet.
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Beat the eggs with 1 tablespoon of the sugar, the vanilla, and milk. Strain the mixture into a lightly buttered aluminium drip pan. Add the sultanas and walnuts.
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Butter the slices of bread. Cut the buttered bread into triangles and float them on top of the egg and milk mixture. Sprinkle the pudding with the remaining 1 teaspoon sugar and the cinnamon.
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Bake the pudding over indirect medium-low heat, with the lid closed, for 30 to 40 minutes, or until the custard is set.
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Serve warm with whipped cream or ice cream.