The opera is by a German composer, Engelbert Humperdinck (1854-1921). "Hänsel und Gretel" was originally written for his niece's puppet show at home. It had only four songs. Then it became a "Singspiel" of 16 songs with piano and finally he orchestrated it to make a whole opera. Premiered under the baton of Richard Strauss in 1893, this is his most famous work. I actually don't know any other pieces by Humperdinck.
To be honest, I had known of the opera for a long time but only heard the Prelude (overture) . But I'm enjoying being part of this production. I feel like there's lots of "Mahler" moments and according to my research, Mahler conducted it in 1894 (I love Mahler, by the way!).
There are lots of videos of "Hänsel und Gretel" on YouTube and I'm watching this one: