Preheat the oven to 190 degrees C. Chop butter into small (1-2cm2) pieces and leave to warm at room temperature. Cream the butter and sugar together until the mixture is a light colour and 'fluffy'.

Sieve in the flour and mix little by little until all the flour has been added. The mixture should become a dough that will hold together when you form it into a ball with your hands.

Add in a few drops of vanilla extract and all the chocolate drops. Knead the dough with your hands until the chocolate drops seem evenly distributed.

Lightly flour a clean surface and roll out the dough to a thickness of roughly 1cm. (About the width of the chocolate drops - they should stop you rolling the dough too thinly.)

Use a heart shaped cookie cutter. Place each biscuit onto a baking tray with grease proof paper. With a large cutter you should make about 20-24 biscuits.

Bake in the oven for 16-20 minutes. Remove when the biscuits look nicely golden. Allow to cool on a wire rack.

Mix icing sugar with a small amount of water until you get a workable but not runny constancy. Mix in a drop food colouring, add in extra drops and mix until you get the shade you want.

Top the biscuits with icing sugar in a heart shape. Use the writing icing pen to write a message to your love. Enjoy with a cup of tea.