We highly recommend having a packaged pork in Gyomu supermarket for pork bowl. This is sooooo yummy!
The product and a blog link are the below only in Japanese.
[Japanese]
業務スーパーのやわらか煮豚、超おすすめ。これは激ウマイ 
商品
https://www.gyomusuper.jp/item/detail.php?go_id=3787
レシピブログ@TABIZINE