Kimchi Grilled Cheese

There are grilled cheese sandwiches, and then there is this grilled cheese sandwich. The moment tangy, funky, fermented kimchi meets a river of melted sharp cheddar between two slabs of golden, butter-crisped sourdough, something magical happens. The heat of the pan wakes up the kimchi's lactic acid bacteria-developed complexity, the cheese tempers its spice, and the bread provides the perfect crunchy vessel. This recipe is my go-to when I want something fast, satisfying, and just a little bit unexpected. It is weeknight comfort food with a probiotic soul.

Ingredients

• 4 slices thick-cut sourdough bread (about ¾-inch thick)
• 1 cup well-fermented napa cabbage kimchi, roughly chopped and squeezed dry
• 4 oz (115g) sharp cheddar cheese, thinly sliced
• 2 oz (55g) low-moisture mozzarella, shredded
• 2 tablespoons unsalted butter, softened
• 1 tablespoon mayonnaise
• 1 teaspoon toasted sesame oil
• ½ teaspoon gochujang (Korean chili paste), optional for extra heat
• 2 teaspoons thinly sliced scallions, for garnish
• Sesame seeds, for garnish

Instructions

Step 1: Prep Your Kimchi and Spread

Remove your kimchi from the jar and give it a rough chop into bite-sized pieces. Place the chopped kimchi into a clean kitchen towel or several layers of paper towel and squeeze firmly to remove excess liquid. This is a critical step — wet kimchi will steam your bread instead of letting it crisp. Set the drained kimchi aside. In a small bowl, combine the softened butter and mayonnaise and stir until smooth. This butter-mayo blend is the secret to an evenly golden, deeply crisp crust. Spread this mixture generously on one side of each bread slice.

Step 2: Build the Sandwich

Place two slices of bread butter-side down on a clean cutting board. On the unbuttered side of each slice, spread a thin layer of gochujang if using — this adds a subtle, smoky depth without overpowering. Layer the cheddar slices evenly across both pieces of bread. Distribute the squeezed kimchi evenly over the cheese on each slice, then top with the shredded mozzarella. The mozzarella acts as a binder, helping hold the kimchi in place. Drizzle a few drops of toasted sesame oil over the kimchi. Place the remaining bread slices on top, butter-side facing up.

Step 3: Cook to Golden Perfection

Heat a cast-iron skillet or heavy-bottomed pan over medium-low heat. Do not rush this step — a pan that is too hot will burn the bread before the cheese melts. Place both sandwiches into the dry skillet (the butter on the bread provides all the fat you need). Cook for 3–4 minutes until the bottom is deep golden brown and the cheese has begun to melt visibly at the edges. Carefully flip each sandwich using a wide spatula. Press down gently with the spatula to encourage contact between bread and pan. Cook for another 3–4 minutes until the second side is equally golden and the cheese is fully melted. Remove from heat, let rest for 1 minute, then slice diagonally. Garnish with scallions and sesame seeds. Serve immediately.

Tips for Success

• Squeeze the kimchi thoroughly — excess moisture is the enemy of crunch. Do not skip this step even if you are in a hurry.
• Low and slow wins the race — cooking over medium-low heat ensures the cheese melts completely before the bread over-browns. A pale, soft sandwich is sad; a burnt one is sadder.
• The mayo-butter blend is non-negotiable — mayonnaise has a higher smoke point than plain butter and helps achieve that perfectly even, diner-style golden crust. Trust the process.
• Room temperature cheese melts better — pull your cheddar out of the fridge 10 minutes before cooking for smoother, faster melting.
• Use aged kimchi for maximum flavour — kimchi that has been fermenting for 3–6 weeks has a complex sourness that balances the fat in the cheese beautifully.

Variations

• Vegan Kimchi Grilled Cheese: Swap the butter for vegan butter, use a cashew-based or oat-based cheddar alternative, and replace the mayonnaise with vegan mayo. Ensure your kimchi is made without fish sauce or salted shrimp for a fully plant-based version.
• Kimchi Grilled Cheese with Pulled Pork: Add 2 oz of leftover pulled pork or slow-braised carnitas per sandwich for a heartier, deeply savoury meal. The pork fat echoes the richness of the cheese while the kimchi cuts right through it.
• Brie and Kimchi Grilled Cheese: Replace the cheddar and mozzarella with thick slices of ripe brie. The creamy, bloomy-rind funk of brie pairs exceptionally well with kimchi's lactic tang for a more elevated, dinner-party-worthy version.
• Kimchi Melt with Fried Egg: Top the finished open-faced sandwich with a fried egg cooked sunny-side up before closing. The runny yolk becomes a rich, impromptu sauce when the sandwich is cut.
• Spicy Tuna Kimchi Melt: Mix one small can of drained tuna with a teaspoon of gochujang and a dash of sesame oil, then layer it with the kimchi for a Korean-inspired tuna melt.

Storage

Kimchi grilled cheese is best eaten the moment it comes off the pan — the contrast between the crispy exterior and the molten interior is fleeting and glorious. That said, if you have leftovers, wrap them loosely in foil and refrigerate for up to 1 day. To reheat, place the sandwich in a dry skillet over medium-low heat for 2–3 minutes per side, or use an air fryer at 350°F (175°C) for 3–4 minutes until the bread re-crisps. Avoid the microwave at all costs — it will turn your beautiful crispy sandwich into a soggy, rubbery disappointment. Do not freeze assembled sandwiches, as the bread texture will degrade significantly upon thawing.