The Loco Moco Burger

For the Gravy:

Cook down mushrooms and onions with 1 tbsp of butter over medium heat. Add garlic and saute for 30 seconds. Add remaining butter and flour. Mix to combine. Add beef stock and simmer until thickened. Season with dark soy sauce and Worcestershire sauce.

For the Crispy Rice:

Simply fry cooked white or brown rice in 350 F oil until golden brown (about 4-5 minutes).

For the Crispy Rice Mayo:

Combine mayonnaise, thinly sliced scallion, lemon juice, and crispy rice. Season with salt if necessary.

(Note: Instructions for forming and cooking the burger patty, as well as the final assembly of the Loco Moco burger, are not explicitly provided in the original content.)