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Protocol: Shio Koji Tri-Tip

Category: proteins Tags: #beef #japanese-ish #high-protein #batch-prep #umami Version: v0.1 Created: 2025-12-30 Servings / Yield: 6-8 servings (from ~600-800g tri-tip slab) Prep time: 5 min (+ 24-72 hour marinade) Cook time: 60-75 min Tools: sheet pan, wire rack, cast iron skillet, instant-read thermometer

Goal / Why this exists

Shio koji is fermented rice with salt — it tenderizes meat through enzymatic action while adding deep, almost funky umami. The sugars caramelize into a beautiful mahogany crust. This is a “set it and forget it” marinade that transforms tri-tip into something that tastes way more complex than the effort involved.

Ingredients (prefer grams)

For the marinade:

600-800g tri-tip, kept as a whole slab
80-100g shio koji (enough to coat all surfaces generously — roughly 10-12% of meat weight)

For searing:

15g (1 tbsp) high smoke-point oil (avocado or vegetable)

Optional finish:

5g sesame oil
Sliced scallions
Toasted sesame seeds

Method (timed steps)

Marinate (24-72 hours ahead)

Pat tri-tip dry with paper towels.
Coat all surfaces with shio koji, spreading evenly. Use your hands — get into the crevices.
Place in a container or zip bag (or vacuum seal if available).
Refrigerate 24-72 hours. 48 hours is the sweet spot — longer = more tender and funky. Don’t exceed 72 hours or texture gets mushy.

Cook Day

Remove from fridge 30-45 min before cooking. Gently scrape off excess shio koji — don’t rinse, just remove the chunks. Some residue is fine and will caramelize.
Preheat oven to 250°F (120°C).
Set tri-tip on wire rack over sheet pan.
Roast until internal temp reaches 115-120°F (46-49°C) at thickest point. About 45-60 min depending on thickness.
Remove from oven. Rest 5 min while you heat the skillet.

Sear

Heat cast iron over medium-high (not screaming high — the koji sugars burn easily).
Add oil. Sear tri-tip 1-2 min per side until deeply browned. Watch carefully — the sugars caramelize fast.
Rest 10 min before slicing. Internal temp will coast to 130-135°F.

Slice

Identify grain direction — tri-tip has two grains meeting in the middle.
Cut in half at the intersection, then slice each half thin (5mm) against the grain.
Optional: Drizzle with sesame oil, top with scallions and sesame seeds.

Success criteria

Internal temp 130-135°F after resting (medium-rare)
Crust is deep mahogany brown, slightly caramelized (not burnt)
Meat is noticeably more tender than standard preparation
Flavor is savory-sweet with umami depth — almost aged beef character
No raw koji flavor (all cooked off)

Variations

Miso-Koji Hybrid:

Mix 60g shio koji with 30g white miso before marinating
Even more umami, slightly sweeter crust

Ginger-Scallion Finish:

After slicing, top with: 30g minced ginger + 40g sliced scallions + 30ml neutral oil heated until shimmering
Pour hot oil over the ginger-scallion mixture on the meat — it sizzles and blooms

Spicy:

Add 10g gochugaru to the shio koji marinade
Or serve with a side of chili crisp

Citrus Ponzu Finish:

Skip the sesame oil
Serve with ponzu + grated daikon on the side

Nutrition (approximate)

Per 115g (4 oz) serving:

Calories: 190-210
Protein: 26g
Fat: 9-11g
Carbs: 2g (from residual koji)

Storage & reheat

Refrigerator: Sliced tri-tip keeps 4-5 days. The koji-treated meat actually holds moisture better than plain roasted.

Reheating:

Best method: Warm slices in skillet over medium heat, 2-3 min. Add a tiny splash of water and cover to steam-heat without drying.
Cold: Honestly excellent cold, sliced thin over rice or salad.

Freezer: Portion and freeze up to 3 months. Thaw overnight.

Notes

Don’t rinse the meat — just scrape off the chunks. The thin residue adds flavor.
Medium-high, not high heat for searing — koji sugars burn faster than you’d expect.
48 hours is ideal. 24 hours works but less tenderizing effect. 72 hours gets very tender, almost soft.
Shio koji is available at Japanese grocery stores or online (Cold Mountain, Hanamaruki brands). Once opened, keeps months in the fridge.

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