If you want the marshmallows to come out as pink as mine, add a few drops of red gel food colouring to the puree. I found without it that the puree wasn't dark enough to show through in the marshmallows. It is just a visual thing though so totally up to you! You can also use liquid red food colouring (rather than gel) - if you use this you'll need more like 1/4 to 1/2 tsp of food colouring.