Make the chimichurri

• Chop the parsley and mince the garlic.
• Combine the parsley, garlic, olive oil, red wine vinegar, chili flakes, oregano, salt and pepper in a bowl.
• Mix well and set aside.

Sear the wagyu steak

• Season the steak generously with salt and pepper.
• Heat a frying pan over high heat and sear the steak.
• Add the butter and baste the steak while it cooks.

Rest the steak

• Transfer the steak to a board and let it rest before slicing.
• Slice the steak against the grain.

Toast the bread

• Toast the halved rolls in the same pan until golden.

Assemble the sandwich

• Spoon chimichurri on the bottom half of each roll.
• Layer the sliced steak on top.
• Add more chimichurri and close the sandwiches.