It has changed a lot. GoAsia is one of the supermarkets where you can buy stuff for Sushi rolls at the moment. I miss the running sushi restaurants at the moment because u could eat as much as you can in a great atmosphere. Hope it comes back soon.
I don't know any place where this specific kind of art is offered. But many artists in Munich are flexible and creativ. I can recommend this artist in Munich:
https://claudia-botz.de/ . Her paintings are very impressive.