Instructions

Add the olive oil to a large cast iron skillet or if you are grilling the scallions toss with the oil. Sear or grill the scallions until softened and deeply charred in parts, about 5 to 8 minutes, turning as needed.

Remove the scallions from the pan or grill, let cool for at least 5 minutes then finely chop. Add the salt.

Slather the bread with dijon, add the butter to the skillet and add two slices of bread. Add 1/2 cup grated gruyere to the bread and half of the scallions. Top with the other piece of bread then grill until deeply golden and the cheese has melted.