Crack the egg into a bowl and whisk until smooth.
Add the lemon juice, zest, and a pinch of salt (plus sugar or honey if you prefer sweetness). Mix well.
Heat a small pan with a little butter or oil.
Pour in the mixture and cook gently over medium-low heat, stirring lightly until it thickens into a creamy lemony custard-like texture.
Remove from the heat and let cool slightly before serving.
Serving and Storage Tips
