After you managed to fix the kitchen, you can see Leah's mother in the kitchen (after you introduced her to Alfred, ofc), which, you can trigger a memory event and have an option of "take cooking lesson" (sth like that). which, you can go through this scene below.

Then the map gone black-screen. like, everything other than the character stat bar is gone.

I can call out the option screen by pressing escape key, but I can't even see my character or the map.
I'm glad that I tried saving the file as a separate one after the cooking lesson, because if you did...
Congratulations, your file is bricked forever.