Citrus and Cinnamon Steamed Egg Custard with Sugar and Vanilla

Method

1. Add lemon zest and cinnamon to the bowl with eggs, sugar, and vanilla extract.
2. In a bowl, whisk eggs, sugar, and vanilla extract until well combined.
3. Gradually add boiling water while whisking. Then add cold water and mix.
4. Strain the mixture through a fine sieve. Pour into a heatproof dish.
5. Steam in a covered pot over boiling water for 20-25 minutes until set.