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Chop the rhubarb and place in a pan with water and granulated sweetener, bring to the boil and leave until rhubarb all falls apart and in nice and soft. 
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Once soft, chop half the strawberries and add to the rhubarb, pour into a blender and blend for a few seconds, you don't want it completely smooth so don't do it for too long. 
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Remove the puree from the blender and allow to cool. 
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Once cold split the natural yogurt into 4 bowls, pour in some of the puree and lightly stir so it marbles. 
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Chop the rest of the strawberries and place on top of the yogurt and puree. 
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Whip the double cream until stiff and add some to the top of each bowl. Place in the fridge to chill until ready to eat or serve immediately. 

