Cook the rice

• Cook the rice until tender and fluffy.

Marinate the beef

• Mince the garlic and chop the beef into 1-inch chunks.
• In a bowl, mix the beef with the olive oil, oyster sauce, soy sauce, garlic, sugar and black pepper.
• Let marinate for 30 min or overnight.

Prep the vegetables

• Chop the bell peppers and onion into big pieces and set aside.

Sear the beef and vegetables

• Oil a large pan over high heat and sear the marinated beef until it crusts up, shaking and tossing it in the pan.
• Remove the beef, add the vegetables and cook until the edges start to char.
• Return the beef to the pan, toss with the butter, then turn off the heat and set aside.

Make the sauce

• In a saucepan, combine the hoisin sauce, peanut butter and water.
• Heat over medium until it thickens and combines, then set aside.

Prepare the nori and beef

• Cut the nori sheets into halves.
• Slice the steak against the grain into tender, pull-apart pieces.

Assemble the musubi

• Fill two thirds of the musubi mold with cooked rice.
• Press the mold down all the way, then release the outside mold while pressing down so the rice shape pops out.
• Top with the shaking beef, vegetables and sauce.
• Wrap with a nori sheet, shiny side outside and rough side inside.

Serve

• Enjoy the musubi right away.