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In the bottom of a large bowl, break up each sponge finger into one third chunks.
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Now prepare the jelly juice.
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In a pan add the lemon juice.
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Add 1tbsp sweetener and put on very low flame. Heat gently until dissolved.
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Add blueberries - still gentle heat until it simmers
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Stir the arrowroot in 1 tsp cold water. Then add to the blueberry mixture. As soon as you add it, start stirring.
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After about 30 secs, the blueberry mixture should be like runny jelly. Remove from heat. Allow to cool for 2 minutes
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Pour evenly over the sponge bits in the bowl.
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Now for the custard
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Take 2 tbsp of milk
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Add the custard powder
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Stir in 0.5 tbsp sweetener and ensure all is dissolved.
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Put remainder milk on medium heat until boiling.
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When boiling, remove off the heat.
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Add custard mixture very slowly to the hot milk AND stir continuously.
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Return pan to heat and gradually bring to boil, stirring continuously.
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At some point (have some patience) the custard will thicken. At that point remove from the pan. Continue to stir. Remember to stir all the time!
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Allow custard to cool for 5 mins. Stirring now and then.
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Pour custard over the blueberry-spong mixture. Cover evenly.
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Let the whole thing cool 5 mins more.
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Top the trifle with the yoghurt.
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Add blueberries to top of the yoghurt.
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Grate lemon rind on top.
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Cool in refridgerator for at least a couple of hours, preferably overnight.