Step 1

In a large bowl, mix together all the ingredients for the burgers until well-combined and form 4 patties. Place in freezer for a few minutes.

Step 2

Saute the onions and mushrooms in a pan on medium heat with olive oil. Set aside once golden, about 5-8 minutes.

Step 3

Using a cast iron grill pan (or barbecue), grill the burgers until no red is visible. Set aside

Step 4

Prepare the gravy by heating up the beef stock, ketchup, soy sauce, oyster sauce, and red pepper flakes in a pan on medium heat and let reduce for about 3 minutes. Combine 1 tbsp cornstarch with 1 tbsp water and stir until it forms a thick slurry. Pour into the gravy and stir until combined. Now add the cooked mushrooms and onions to the gravy and heat for another minute.

Step 5

Fry all four eggs, keeping the yolks runny.

Step 6

Construct the loco moco by placing rice in a circle on a plate, followed by the patty, then the gravy, then an egg, and finally, top with some sliced green onions and black pepper. Serve warm.