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

  1. 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

  2. Marinate with shio koji

    Generously coat the entire rack of lamb with shio koji, making sure every surface is covered.

    Time: PT5M

  3. Marination

    Place the coated rack on a tray or rack and refrigerate uncovered for at least 12 hours (overnight).

    Time: PT12H

  4. 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

  5. Herb butter mixture

    In a small bowl, combine softened butter, chopped thyme, rosemary, and minced garlic.

    Time: PT5M

  6. 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

  7. Brown meat side

    Flip the rack and brown the meat side over medium heat for about 5 minutes.

    Time: PT5M

  8. 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

  9. 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

  10. Final sear

    Increase heat to high and give the rack a quick 2‑minute sear on each side to crisp the fat.

    Time: PT2M

  11. Rest the lamb

    Transfer the rack to a wire rack and let it rest for 10 minutes before carving.

    Time: PT10M

  12. 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

Last updated: April 9, 2026

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Butter-Basted Shio Koji Rack of Lamb – Crispy Fat, Juicy Pink Meat

Recipe by W2 KITCHEN

A succulent rack of Welsh saltmarsh lamb marinated overnight in shio koji, then pan‑seared and butter‑basted with thyme, rosemary, and garlic. The method renders the fat cap, creates a crisp, flavorful crust, and delivers juicy, medium‑rare meat without the need for a sauce.

MediumBritishServes 4

Shop all ingredients on Amazon in one click • Printable PDF with shopping checklist

Source Video
12h 44m
Prep
18m
Cook
1h 34m
Cleanup
14h 36m
Total

Cost Breakdown

$34.64
Total cost
$8.66
Per serving

Critical Success Points

  • 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

Safety Warnings

  • Handle the hot skillet and melted butter with care to avoid splatter burns.
  • Use a meat probe to ensure safe internal temperature.
  • Wash hands and all surfaces after handling raw lamb.

Frequently Asked Questions

Everything you need to know about this recipe

Q

What is the cultural significance and history of rack of lamb in Welsh cuisine?

A

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.

cultural
Q

What are the traditional regional variations of lamb dishes in British cuisine?

A

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.

cultural
Q

How is shio koji traditionally used in Japanese cooking and how does it differ from miso?

A

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.

cultural
Q

What occasions or celebrations is rack of lamb traditionally associated with in Welsh culture?

A

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.

cultural
Q

What other British dishes pair well with shio koji marinated butter basted rack of lamb?

A

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.

cultural
Q

What are the most common mistakes to avoid when making shio koji marinated butter basted rack of lamb?

A

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.

technical
Q

Why does this recipe use butter basting instead of a traditional herb crust?

A

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.

technical
Q

Can I make the shio koji marinated butter basted rack of lamb ahead of time and how should I store it?

A

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.

technical
Q

What texture and appearance should I look for when the rack of lamb is properly cooked?

A

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.

technical
Q

How do I know when the shio koji marinated butter basted rack of lamb is done cooking?

A

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.

technical
Q

What does the YouTube channel W2 KITCHEN specialize in?

A

The YouTube channel W2 KITCHEN focuses on straightforward, technique‑driven home cooking tutorials that highlight quality ingredients and simple methods for flavorful results.

channel
Q

How does the YouTube channel W2 KITCHEN's approach to British cooking differ from other cooking channels?

A

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.

channel

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