I hope you can help me in this chocolate mooncake recipe.

According to Ann Phua's recipe I dont understand the glazing part.

She wrote glazing:
1 egg yolk
25g sweet & bitter chocolate.

!) How to you glaze the egg yolk with the chocolate.
2) Is it glaze with egg yolk, bake it when done take it out let cool and then glaze with chocolate. Do we need to bake again.

Hope you can answer my question.

Thank you very much

Christine