01 -
Combine the butter with garlic and dill in a bowl until smooth. Keep it to the side.
02 -
Put the steak in the freezer for a little while so it's easier to slice into thin strands.
03 -
In a hot skillet with oil, toss in the steak slices, sprinkle with salt, and sear until they're lightly browned. Take them out when done.
04 -
Throw the onion slices into the same pan, cooking them until they turn a nice golden shade. Remove and set aside.
05 -
Split your baguette in half and smear both sides with the prepared herb butter. Pile on the steak, onions, and cheese slices.
06 -
Leave the sandwich open-faced under a broiler just until the cheese melts and starts bubbling. Serve right away while it's hot.