Astrobaking: Stellar Christmas Tree Decorations

Amateur astronomer and baker Katharine Kilgour pays tribute to the winter nights of stargazing with some festive stellar Christmas tree ornaments.

Katharine Kilgour likes to combine her love of astronomy with her love of cooking, making tasty treats to feed herself, her friends and her family Astro-boy (aged 12), Astro-girl (aged 16) and Astro-dad.

Bring the cosmos to the Christmas table this year with Katharine's star-filled wreath cake
Credit: Katharine Kilgour

The winter solstice and the darkest nights of the year are upon us.

If the clouds stay away we have maximum stargazing opportunities and, because it's Christmas, we have maximum star-baking opportunities. Everyone loves a star at Christmas!  

Our Christmas tree is a tribute to our love of stars and creativity. Every year we seem to add new ones using our latest crafting trend.

There are stars made from hama beads, threaded beads, origami stars, crochet stars and knitted stars too. All a tribute to the evolving crafting abilities of Astro Girl and Boy on wet winter days.  

But the best ones are the ones we can eat! An opportunity to go wild with gingerbread, icing and sweets.

We can add shiny stained glass stars, two-tone stars and write everyone’s name in stars, all from one batch of dough!

This dough is really fun to make; baking and science unites for the bicarbonate of soda explosion!

If you have a go at baking Katharine's Christmas star decorations, be sure to share your pictures with us via Twitter and Facebook.


Credit: Katharine Kilgour



100g light brown sugar

75g dark brown sugar

85g golden syrup 

100g salted butter

350g plain flour

1 tsp bicarbonate of soda

1 tsp mixed spice

2 tsp ground ginger

3 tblsp milk

Zest of half an orange

White writing icing

Boiled sweets and other decorations

Food colouring (preferably red and green)

Star-shaped biscuit cutters



1. In a heavy based saucepan melt the butter, sugars and syrup. Bring to the boil then simmer for two minutes.


2. Add the bicarbonate of soda and stir. The mixture will puff up. Leave to cool for 15 minutes and it will continue reacting.


3. Sift the flour and spices into a bowl, add the syrup mix, milk and orange zest. Mix and knead until smooth. If it is too dry, add a little more milk. Knead it into a ball, wrap it in clingfilm and refrigerate for half an hour.


4. If you want to make two-tone stars, take some of the mixture before wrapping and add two different food colours, such as red and green. Knead them in until thoroughly mixed, then wrap the different coloured doughs separately. Refrigerate for half an hour.


5. Get out your star cutter collection. This is how I justify the many biscuit cutters I’ve collected over the years!


6. To make two tone stars, roll the two colours out 3mm thick. Use a set of star cutters so that you can swap the concentric stars between biscuits.  


7. Use a drinking straw to pierce a hole in each biscuit so that a ribbon can be threaded through once they're baked and cooled, for hanging them on the tree later


8. To make 'stained glass' stars, line a baking tray with well-oiled greaseproof paper or, better still, use a silicone baking liner. The sugar in the sweets is going to melt and will stick almost permanently without this.


9. Roll out the plain mixture to 3mm thick. Cut star shapes and place them on the baking tray. Cut smaller stars out of them and place a boiled sweet in the gap. It will melt in the oven and fill the hole. You can break sweets up and mix the colours too.

For the iced biscuits cut star shapes and place them on a lightly oiled baking tray, there is no need for lining paper. Use a drinking straw to make hanging holes as above

Bake the biscuits at 180°C for 10 – 15 minutes (depending on size) until they are firm and beginning to brown.


10. Transfer the biscuits to a wire rack to cool. Remember to allow the stained glass ones to cool on the tray until the sweets have set hard again before removing them from the tray.


11. Once cooled, use your icing and sweets to decorate the plain biscuits with Christmas messages or names. Allow to dry completely before hanging


12. Thread ribbon through the holes and hang on your Christmas tree. Try to hang the stained glass ones in front of your tree lights to get the full effect!


13. For hygiene reasons, if you plan to hang your biscuits on the tree then eat them, you should wrap them in clingfilm or cellophane gift bags.



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