Place the bone marrow on a tray and roast at 200 degrees Celsius for 15 minutes without salt or pepper.
In a pot, add whole garlic and olive oil, then simmer over low heat until the garlic becomes soft, creating garlic puree.
Let the unsalted butter sit at room temperature until soft, then mix in the roasted bone marrow.
Add 12 crushed garlic cloves, lemon zest, salt, and pepper, then vigorously stir for about 5 minutes until all ingredients are well combined, completing the custom butter.
Mash 2 boiled potatoes with a large spoonful of bone marrow butter, fill the hollowed-out bone marrow bones with the mixture, and bake at 200 degrees Celsius for 15 minutes until golden brown.
Tie the ribeye steak with kitchen twine to shape it into a uniform cylinder, then season with olive oil, salt, and pepper.
Sear the steak in a hot pan, then continuously pour melted custom butter over the meat to baste it.
Remove the steak when the internal temperature reaches 45 degrees Celsius, rest for 10 minutes, then plate with mashed potato.
Roast the bone marrow in the oven and extract the marrow; cook garlic in olive oil to make garlic puree.
Mix the roasted marrow, crushed garlic, lemon zest, salt, and pepper into softened butter to create the custom butter.
Season the ribeye steak and sear it in a pan, basting it continuously with the custom butter.
Rest the steak for 10 minutes, then serve alongside the roasted bone marrow potato gratin.
Cooking tips 💡
Always take the butter out of the refrigerator ahead of time to soften so it blends smoothly with the marrow and other ingredients without separating.
Use only the thin yellow outer layer of the lemon peel when grating the zest—this ensures a bright, refreshing aroma without bitterness.
Choose a thick, cylindrical ribeye steak of at least 4–5cm thickness for better visual appeal and superior juice retention after cooking.
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