350g (9oz) plain flour
pinch of salt
175g (6oz) butter, room temperature
100g (4oz) caster sugar
green food colouring, if desired (colouring paste is preferable - if you use liquid food colouring you may need to use quite a lot, which will make the dough even softer)
1 small egg, beaten
chocolate spread for sandwiching biscuits together
round cookie cutter, approximately 6cm in diameter
OPTIONAL: dinosaur model toy (to make at least one footprint per biscuit), cleaned and dry