Pre-heat oven to 160°C/fan 140°C/ gas mark 5.
Cream the butter and sugar together.
Fold the Fate Low Protein All-Purpose Mix into the butter and sugar mixture until it is mixed well.
In a separate bowl, combine the water, egg replacer, food colouring and vanilla essence.
Add the wet ingredients to the Fate Low Protein All-Purpose Mix and butter mixture and combine until a stiff dough is formed.
Cover a baking tray with greaseproof paper.
Between two sheets of greaseproof paper roll out the dough to 3cm thickness.
Cut 12 hearts out of the dough using the heart cutter and place on the baking tray.
Bake for 20 minutes.
Using a spatula, remove cookies from the baking tray and leave to cool on a wire rack.
Once cooled, spread 1 tbsp of icing on 6 of the hearts and sandwich the icing with the other 6 hearts.
Fate Low Protein All-Purpose Mix is a food for special medical purposes and must be used under medical supervision. This recipe has been specifically designed for a low protein diet.
Refer to labels for allergen and other product information.