Loco Moco with Mushroom-Miso Gravy

This recipe was inspired by two different instances where I had really good loco moco. One was when I was in Hawaii, specifically at Moena Cafe in Oahu, and the other from Ryla restaurant in Redondo Beach! Moena Cafe had a short rib loco moco with this rich, deep demi glas gravy that made me…