Cream the butter and sugar together until fluffy.

Add the egg and vanilla extract and mix well.

Gradually add the flour and mix together to from a dough.

Divide the dough into six equal parts and add a different food colour to each.

Wrap each bit of dough in clingfilm and leave in the oven for 30 minutes to chill.

Preheat the oven to 180C, 350F, Gas Mark4

Take one of the chunks of dough and roll into a strip between two sheets of baking paper. It should be about 5mm thick

Repeat this with the other bits of dough stacking the strips up in the correct colour order until you have a recectangle made of the stack of colours.

Cut into strips to make even sized biscuits.

Bake in the oven on a baking sheet with baking parchment on for 15-20 minutes.

Leave to cool.

When cooled melt the chocolate in a bowl over bowling water. Dip each biscuit into the chocolate and sprinkle with hundreds and thousands.

Leave to set.