Butter-Basted Shio Koji Rack of Lamb – Crispy Fat, Juicy Pink Meat
Butter-Basted Shio Koji Rack of Lamb – Crispy Fat, Juicy Pink Meat is a medium British recipe that serves 4. 420 calories per serving. Recipe by W2 KITCHEN on YouTube.
Prep: 12 hrs 20 min | Cook: 35 min | Total: 13 hrs 10 min
Cost: $34.64 total, $8.66 per serving
Ingredients
- 1 rack Rack of Lamb (about 1.5 kg, ask butcher to remove the chine bone)
- 0.25 cup Shio Koji (store‑bought or homemade, used to coat the lamb generously)
- 4 tablespoons Unsalted Butter (softened for easy mixing)
- 2 tablespoons Fresh Thyme (leaves only, chopped)
- 1 tablespoon Fresh Rosemary (finely chopped, optional)
- 2 cloves Garlic (minced)
Instructions
Ask butcher to remove chine bone
Have your butcher remove the chine (feather) bone from the rack of lamb so the meat is easier to carve and cook evenly.
Time: PT5M
Marinate with shio koji
Generously coat the entire rack of lamb with shio koji, making sure every surface is covered.
Time: PT5M
Marination
Place the coated rack on a tray or rack and refrigerate uncovered for at least 12 hours (overnight).
Time: PT12H
Prepare for cooking
Using the back of a knife, scrape off excess shio koji rice, then pat the surface dry with paper towels.
Time: PT5M
Herb butter mixture
In a small bowl, combine softened butter, chopped thyme, rosemary, and minced garlic.
Time: PT5M
Render fat cap
Heat a large skillet over medium heat. Place the rack fat‑side down (pan cold) and cook until the fat renders and begins to brown, about 8 minutes.
Time: PT8M
Brown meat side
Flip the rack and brown the meat side over medium heat for about 5 minutes.
Time: PT5M
Butter basting
Add the herb butter to the pan, tilt to melt, and continuously spoon the melted butter over the rack for about 10 minutes, basting both the meat and the fat.
Time: PT10M
Monitor internal temperature
Insert a meat probe into the thickest part of the lamb; aim for 48°C. The temperature will rise to about 54°C during resting.
Time: PT2M
Final sear
Increase heat to high and give the rack a quick 2‑minute sear on each side to crisp the fat.
Time: PT2M
Rest the lamb
Transfer the rack to a wire rack and let it rest for 10 minutes before carving.
Time: PT10M
Carve and plate
Slice between the ribs into individual chops, garnish with a sprig of mint if desired, and serve immediately.
Time: PT5M
Nutrition Facts
- Calories
- 420
- Protein
- 30 g
- Carbohydrates
- 1 g
- Fat
- 30 g
- Fiber
- 0 g
Dietary info: Gluten-Free, Keto, Paleo
Allergens: Dairy
Ingredient Substitutions
- Instead of Shio Koji: Miso paste (use less salt), Soy sauce (thin with water)
- Instead of Unsalted Butter: Ghee (for dairy‑free), Olive oil (different flavor)
- Instead of Fresh Thyme: Dried thyme (½ tsp), Tarragon
- Instead of Fresh Rosemary: Dried rosemary (¼ tsp), Sage
- Instead of Garlic: Garlic powder (¼ tsp), Shallot (1 small, minced)
Equipment Needed
- Sharp Boning Knife
- Baking Tray or Rack
- Large Skillet
- Meat Probe Thermometer
- Tongs
- Basting Spoon
- Wire Rack
- Small Bowl
Critical Steps — Do Not Skip
- Ask butcher to remove chine bone
- Marinate with shio koji
- Prepare for cooking (scrape and dry)
- Render fat cap
- Butter basting
- Monitor internal temperature
- Final sear
Chef Tips from the Video
- Pat the lamb completely dry before searing for the best crust.
- Use a heavy‑bottomed skillet for even heat distribution.
- Add a splash of dry white wine to the pan after basting for a quick deglaze if desired.
Troubleshooting
Fat cap does not render and stays rubbery.
Lower the heat and cook the fat side longer, covering the pan briefly to trap steam, or finish the rack in a low oven (150°C) for 10 minutes.
Koji burns and gives a bitter taste.
Reduce the heat immediately, wipe excess burnt bits, and finish cooking with a clean portion of butter.
Lamb is overcooked and dry.
Check temperature earlier; aim for 48°C internal and let carry‑over cooking finish the doneness during rest.
Storage
Refrigerator: Store leftovers in an airtight container for up to 3 days.
Freezer: Wrap tightly in foil and freeze for up to 2 months.
Room temperature: Do not leave at room temperature for more than 2 hours.
Make-Ahead Tips
- Marinate the rack overnight in shio koji for best flavor and tenderness.
- Prepare the herb butter a day ahead and keep it refrigerated.
- You can pre‑render the fat cap, let it cool, and finish the basting step just before serving.
Frequently Asked Questions
What is the cultural significance and history of rack of lamb in Welsh cuisine?
Welsh lamb, especially saltmarsh lamb, is prized for its distinctive, slightly sweet flavor that comes from grazing on coastal grasses. Rack of lamb is often served for special occasions and showcases the quality of the meat without heavy sauces.
What are the traditional regional variations of lamb dishes in British cuisine?
British lamb dishes range from classic roast leg of lamb with rosemary to Scottish haggis and Welsh lamb stew. While the rack is less common, it is celebrated for its tenderness and is often prepared simply to let the meat shine, as in this shio koji marinated version.
How is shio koji traditionally used in Japanese cooking and how does it differ from miso?
Shio koji is a fermented seasoning made from rice koji, salt, and water. Unlike miso, it has a milder, less salty flavor and is used to tenderize and lightly season proteins. In this recipe it enhances the lamb without overpowering its natural taste.
What occasions or celebrations is rack of lamb traditionally associated with in Welsh culture?
Rack of lamb is often served at festive gatherings such as Christmas, Easter, and weddings in Wales, where the high‑quality lamb is a centerpiece that reflects hospitality and abundance.
What other British dishes pair well with shio koji marinated butter basted rack of lamb?
Serve the lamb alongside roasted root vegetables, minted peas, or a simple buttered new potato salad. A crisp green salad with a mustard vinaigrette also balances the richness.
What are the most common mistakes to avoid when making shio koji marinated butter basted rack of lamb?
Common errors include not drying the surface before searing, using too high heat which burns the koji, and over‑cooking the meat. Always pat the lamb dry, keep heat moderate during basting, and monitor internal temperature with a probe.
Why does this recipe use butter basting instead of a traditional herb crust?
Butter basting allows continuous flavor infusion and fat rendering while keeping the meat moist. A herb crust can form a barrier that prevents the rendered lamb fat from fully integrating with the aromatics.
Can I make the shio koji marinated butter basted rack of lamb ahead of time and how should I store it?
Yes. Marinate the rack overnight, then cover and refrigerate. After cooking, leftovers can be stored in an airtight container in the refrigerator for up to three days or frozen for two months.
What texture and appearance should I look for when the rack of lamb is properly cooked?
The fat cap should be golden‑brown and crisp, while the meat should show a pink center with a slight gradient toward the exterior. The interior temperature should read about 48°C before resting.
How do I know when the shio koji marinated butter basted rack of lamb is done cooking?
Insert a meat probe into the thickest part; when it reaches 48°C, remove the rack. During the 10‑minute rest the temperature will rise to the target 54°C for medium‑rare.
What does the YouTube channel W2 KITCHEN specialize in?
The YouTube channel W2 KITCHEN focuses on straightforward, technique‑driven home cooking tutorials that highlight quality ingredients and simple methods for flavorful results.
How does the YouTube channel W2 KITCHEN's approach to British cooking differ from other cooking channels?
W2 KITCHEN emphasizes minimal ingredient lists, precise temperature control, and practical tips like overnight marinating, allowing home cooks to achieve restaurant‑level results without complex equipment.
Last updated: August 23, 2026
