Green Onion Grilled Cheese

Rinse the 4 green onion stalks under cool running water and pat dry with the corner of the fixed linen towel. Place them on the bamboo cutting board, and use the santoku knife to trim off the dry root ends and any wilted dark green tips. Thinly slice the stalks into 3mm thick rounds, keeping both the crisp white/light green sections and delicate dark green tops. Transfer all sliced onions to the stainless steel mixing bowl. Discard the trimmed root ends and wilted tips into a small scrap pile at the corner of the board.

Hold the 80g block of sharp cheddar against the coarse side of the stainless steel box grater, and grate all of the cheese directly into the mixing bowl with the sliced green onions. Add the 1/8 teaspoon black pepper and half the flaky sea salt, then toss gently with clean fingers to evenly distribute the onion pieces and pepper through the shredded cheese. Keep the cheese mixture light and fluffy, do not pack it down, as this prevents even melting.

Lay all 4 slices of sourdough bread flat on the bamboo cutting board. Use the beech wood butter knife to spread 1/2 tablespoon of softened unsalted butter evenly across one entire side of each bread slice, spreading all the way to the crust edges to eliminate dry spots. The buttered side will form the crispy exterior of the sandwich, so aim for a thin, consistent layer about 1mm thick. Sprinkle the remaining half of the flaky sea salt lightly over all buttered surfaces.

Flip two of the bread slices over so the buttered side faces down on the cutting board. Divide the cheese and green onion mixture evenly between the two slices, spreading it in a loose, even layer right up to the crust edges to avoid bare spots when melting. Top each with the remaining two bread slices, buttered side facing up, pressing down gently with the palm of your hand to adhere the layers. Ensure no filling spills over the edges of the bread to avoid burnt cheese in the pan.

Retrieve the 10-inch matte black carbon steel skillet and place it on the stovetop over medium-low heat (325°F / 160°C for electric ranges). Let it preheat for 2 full minutes—do not rush this step, as an evenly heated pan prevents burnt bread spots and ensures the cheese melts fully from edge to center. No extra butter is needed in the pan, as the bread slices are already buttered.

Carefully lift one assembled sandwich with the stainless steel spatula and place it in the preheated skillet. Cook for 3 to 4 minutes, resisting the urge to press down on the sandwich (pressing squeezes out melted cheese and compresses the bread into a soggy texture). The first side is ready to flip when the underside is deep golden brown, crisp to the touch, and the cheese at the bread edges is just starting to bubble and melt. Cook one sandwich at a time to avoid crowding the pan.

Slide the spatula fully under the sandwich to support the entire slice, and flip it in one smooth motion to avoid spilling filling. Cook the second side for another 2 to 3 minutes, until it matches the first side’s deep golden crispness, and all the cheese in the center is fully melted (look for thin strands of oozing cheese at the crust edges as a visual cue). Transfer the finished sandwich to the fixed cream white ceramic plate, then repeat the cooking process with the second sandwich.

Let both cooked sandwiches rest on the cream plate for 1 full minute before slicing—this allows the melted cheese to set slightly so it does not run out when cut. Use the santoku knife to slice each sandwich diagonally in half, arranging the cut sides to face outward to show the green onion-flecked cheese filling. Serve immediately while the bread is crisp and the cheese is stretchy.