I encountered it here
https://www.yomiuri.co.jp/local/michinoku/20230418-OYT8T50006/
「上寿し【??】」は800【はっぴゃく】円【えん】、「人生相談【じんせいそうだん】」はゼロ円【えん】
"---" is 800 yen, and "life counseling" costs zero yen.
I also found it here... https://hanazen-michinobechuou.eeat.jp/product/上寿し2人盛〜5人盛-※表示価格は2人盛です/
...but I have not found a dictionary entry for it. What is it, and how is it pronounced?