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Preheat oven to fanbake 180°C.
Melt butter in a large microwave proof bowl, add sugar and stir together.
Crush in weetbix, add flour, coconut and baking powder. Mix together.
Pour into a lined tray and press down firmly.
Bake for 15 - 20 mins. Until it is cooked through but soft to touch. It will firm up as it cools.
Icing: Mix together icing sugar, butter, lemon juice and zest. Add boiling water if needed to loosen mixture and whisk out any lumps.
Ice the slice while it is still warm then chop up once cooled and icing has set.
Store in an airtight container in the fridge or in a cool dry place.