This is a creamy, buttery, sweet frosting that you can use on cupcakes or cakes. You could even play around with different flavors in place of the vanilla used here.
1. Pour the cold water into a small saucepan. Whisk in the arrowroot flour until completely dissolved.
2. Cook over moderately high heat, whisking continuously until the mixture reduces and thickens. Pour into a small bowl and set aside to cool a little.
3. Use this time to make the frosting: Add the softened butter, sweetener, and vanilla essence into a large bowl and use a hand mixer to cream the mixture together until light and fluffy.
4. Pour in the arrowroot mixture and mix well to incorporate.
5. Fill a piping bag and decorate your cupcakes, or simply use an icing spatula to frost your cake.