Leek Grilled Cheese

Trim off the tough dark green tops and fibrous root ends from 2 medium leeks; discard trimmings. Place leeks on the walnut cutting board and use the santoku knife to slice the white and pale green sections into 1/4-inch thick half-moons. Transfer sliced leeks to the small stainless steel prep bowl filled with cold tap water, swish vigorously to dislodge trapped grit between layers, then let rest 2 minutes for dirt to sink. Lift leeks from the water (do not pour the bowl, which will re-deposit dirt) and pat completely dry with a corner of the green tea towel. Dry leeks are critical for even caramelization without steaming.

Place the 10-inch carbon steel skillet on the stovetop over medium-low heat, add 1 tablespoon of unsalted butter. Once butter is melted and foaming subsides (approx 1 minute), add the dried sliced leeks, 1/4 teaspoon flaky salt, 1/8 teaspoon black pepper, and 1 teaspoon fresh thyme leaves. Stir with the sage green silicone spatula to coat leeks in butter, then cook 10-12 minutes, stirring every 2 minutes, until leeks are soft, deep golden, and jammy, with no crisp raw texture left. Do not turn heat up too high, or leeks will burn instead of caramelizing.

Transfer the finished caramelized leeks from the skillet back to the small stainless steel prep bowl, set aside. Wipe the skillet lightly with a corner of the tea towel to remove any stray leek bits, return to medium-low heat. Use the stainless steel butter spreader to spread the remaining 3 tablespoons of softened unsalted butter evenly across one side of each of the 4 sourdough slices, coating all the way to the crust edges. Thin, even butter coverage ensures every bite of crust is crisp, not dry or burnt.

Flip 2 of the buttered bread slices so the buttered side faces down (this will be the outside of the sandwich that hits the pan). Layer half the sliced sharp cheddar evenly across each unbuttered side, top with all the caramelized leeks divided evenly between the two sandwiches, then sprinkle half the shredded Gruyère over the leeks on each. Top with the remaining 2 bread slices, buttered side facing up, pressing gently to adhere the layers. Shredding the Gruyère helps it melt faster than thick slices, preventing burnt bread before cheese is fully melted.

Carefully place both assembled sandwiches into the pre-warmed carbon steel skillet over medium-low heat. Cook 4 minutes, pressing gently with the silicone spatula every 60 seconds, until the bottom bread slice is deep golden brown, crisp, and the cheese closest to the pan is fully melted. Resist the urge to turn heat to high; medium-low heat ensures crisp bread without burning, and gives cheese time to melt fully.

Use the silicone spatula to carefully flip each sandwich in one smooth motion. Cook an additional 3-4 minutes on the second side, pressing gently occasionally, until the second side is equally deep golden and crisp, and all cheese is fully melted and stretchy when you lift a corner of the bread. If bread browns too fast before cheese melts, turn heat down to low and cover the skillet with a lid for 1 minute to trap steam and melt cheese faster.

Transfer cooked sandwiches from the skillet to the walnut cutting board, let rest 1 minute to allow cheese to set slightly (this prevents all the cheese from oozing out when you cut). Use the santoku knife to cut each sandwich diagonally into two triangular halves, wiping the knife blade between cuts for clean edges.

Transfer the cut sandwich halves to the matte cream ceramic lunch plate, arranging them slightly offset to show the cross-section of melted cheese and leeks. Tuck a small sprig of fresh thyme next to the sandwiches for garnish, and serve immediately while warm and crisp.