Add orange juice, water, colouring and sugar together in a small pot. Stir with a hand whisk under low heat until sugar dissolved and leave to cool. Do not boil the orange juice otherwise you'll get a bitter taste of it.
Sieve self raising flour into a large bowl. Pour the orange juice directly to the flour, follow by beaten egg and melted butter. Stir well with a hand whisk.
Lastly add in the candied orange peels and orange zest, fold well with a rubber spatula.
Divide batter evenly into 7-9 cupcake liners (depend on the size of the liners) to ¾ full and steam at high heat for about 10-12 minutes.
Recipe by Anncoo Journal at https://www.anncoojournal.com/steamed-orange-cupcakes/