What cut of beef is best for negimaki?
Look for thin-sliced beef sold for shabu-shabu, sukiyaki, or hot pot. If you cannot find it, ask the butcher for top sirloin or flank steak sliced very thin against the grain. The thinner the beef, the easier it rolls and the faster it cooks.
Do I need toothpicks or kitchen twine?
You need something to keep the rolls from relaxing in the pan. Toothpicks are quickest. Twine is great if you want a clean look and are making a bigger batch. If your beef slices are long enough to overlap well, you can sometimes skip both, but it is a gamble.
Why blanch the scallions first?
Blanching makes scallions flexible so they roll without breaking, and it tones down the sharp raw flavor. It also helps the scallions cook through before the beef overcooks.
Can I prep negimaki ahead of time?
Yes. You can assemble the rolls up to 1 day ahead, cover tightly, and refrigerate. Cook right before serving for the best sear. The glaze can be mixed ahead too.
How do I keep the glaze from burning?
Two moves: (1) wipe out excess rendered fat if the pan is very greasy, and (2) reduce the heat to medium-low when you add the tare. Sugar plus high heat equals bitter, fast. If it starts to look dry, add a small splash of water and let it reduce again.
Is negimaki gluten-free?
It can be. Use tamari or a certified gluten-free soy sauce, and double-check your mirin (some aji-mirin products include additives and may contain gluten depending on brand). Sake is typically gluten-free.
Do I need sesame oil in the glaze?
No. It is a tasty, slightly nutty add-on, but not required for a more classic soy-mirin-sake style glaze. If you prefer, leave it out and finish with sesame seeds instead.