Prepare the Konnyaku: Make lattice-like cuts on the surface of the konnyaku block, then slice it.
Boil the Konnyaku: Bring a pot of water to a boil, add the konnyaku, and boil for 2 minutes. Drain the konnyaku and pat it dry with paper towels to remove excess moisture.
Cook the Konnyaku: Heat oil in a frying pan over medium-high heat. Add the konnyaku slices to the pan and cook for 2-3 minutes on each side or until they are slightly golden brown.
Add Butter and Garlic: Add butter and crushed garlic to the pan. Sauté for a couple of minutes to allow the konnyaku slices to absorb the flavors of butter and garlic.
Add the Sauce: Add sake, mirin, and soy sauce to the pan. Cook, stirring occasionally, until the sauce thickens and coats the konnyaku slices, about a couple of minutes.
Serve: Transfer the cooked konnyaku slices to a serving plate. Top generously with chopped scallions.
Notes
Storage: Store in an airtight container in the refrigerator for up to 3 days.
Making shallow cuts on the konnyaku helps the sauce soak in better and gives the steaks a tastier flavor.
Boiling konnyaku helps to remove any residual odor and firms up the texture. It also allows the flavor to be easily absorbed.