Add the flour, yeast, sugar and salt to a large mixing bowl.
Slowly add the water to the bowl and bring together into a firm dough - it should not be too wet or sticky.
Knead the dough either (1) by hand on a lightly floured work surface for 10 minutes; or (2) using the dough hooks on an electric mixer for 5 minutes, or until the dough is a soft, springy, smooth ball.
Cut the dough into 5 equal sized pieces and add 3-5 drops of food colouring to each ball so that you will end up with three distinct balls of coloured dough.
Knead the food colouring into the dough either by hand or using dough hooks on an electric mixer.
Add more food colouring and continue to knead until you have an even, bright colour.
Cover the balls of dough and leave for 1 hour or until each ball of dough has doubled in size.