15-Minute Tamari Marinated Steak Salad

⏲ ~19 min total · prep 4 · cook 15 · 4 servings

By the KFI Test Kitchen · Tested & approved by Jason Lieu, KFI recipe editor

Published Sep 15, 2026 · Updated Nov 2, 2026

Ingredients

• 1 lb flank steak, patted dry
• 3 tbsp tamari
• 1 tbsp toasted sesame oil
• 1 tsp finely grated fresh ginger
• 1 tbsp avocado oil
• 5 oz baby spinach and arugula, mixed
• 1 Persian cucumber, sliced into thin coins
• 4 radishes, shaved paper-thin
• 1 avocado, sliced
• 2 tsp fresh lime juice
• 1 tsp toasted sesame seeds

Instructions

1. Whisk the tamari, sesame oil, and ginger in a shallow dish, add the steak, and turn to coat. Let it sit at room temperature for 5 minutes while you heat the pan and build the salad — any longer and the tamari over-cures the surface.
2. Set a 12-inch cast-iron skillet over high heat until it just begins to smoke, about 3 minutes, then add the avocado oil and swirl.
3. Lay the steak in the pan and sear without moving it for 2 1/2 minutes, then flip and sear 2 minutes more for medium-rare (130°F internal on an instant-read thermometer).
4. Move the steak to a cutting board and let it rest 5 minutes; the juices will pool back toward the center.
5. While it rests, toss the greens, cucumber, radishes, and avocado in a wide bowl with the lime juice and a pinch of salt, just until the leaves glisten.
6. Slice the steak thin, against the grain, holding the knife at a shallow angle.
7. Fan the slices over the salad, spoon the skillet drippings over the top, and finish with the sesame seeds.

Why this recipe works

• A short marinade, on purpose Five minutes of tamari at room temperature seasons the surface, and longer starts to cure it. The capped soak is also what makes the 15-minute total possible.
• Cast iron until it smokes Three minutes of preheat and 2 1/2 untouched minutes per side build a crust the pan drippings carry over the greens. A cooler pan braises flank steak instead of searing it.
• Drippings as dressing The pan sauce, tamari-dark and beefy, spoons over the salad in place of any separate dressing. Nothing built in the skillet gets washed away.

Tips for making this recipe well

Dry the steak first

Surface moisture steams before it sears. The recipe calls for the steak patted dry, and the crust depends on it.

Slice against the grain

Flank steak runs long fibers, and a shallow angle across them shortens every chew. Cutting along the grain is the reason flank gets called tough.

Rest the full 5 minutes

The juices pool back toward the center while the steak sits on the board. Sliced too soon, they end up on the cutting board instead of in the meat.

Build the salad during the rest

Greens, cucumber, radishes, and avocado get tossed with lime while the steak settles. That overlap is why the whole plate lands in 15 minutes.

Shave the radishes thin

Paper-thin radish folds into the leaves; thick coins clump at the bottom of the bowl. A vegetable peeler does the job without knife skills.

Serving suggestions

Fan the slices over the dressed greens, spoon every drop of pan drippings over the top, and finish with sesame seeds. At 6.5 net carbs per serving this is a full main-course salad, rich enough that the avocado is the only creamy thing it needs. Eat it while the steak is still warm; seared beef against cold greens is the reason the salad gets built during the rest. The spinach and arugula wilt slightly under the warm slices, which is part of the design rather than a flaw.

Storage and meal prep

Store the components separately, sliced steak in one container and undressed greens in another, both 3 to 4 days in the fridge. The steak eats cold over fresh greens straight from the container, which is how most of the leftovers get finished. Once tossed with lime, the spinach and arugula wilt within hours, so dress only what you plan to eat. Cooked steak freezes for 2 to 3 months, thawed overnight; reheated flank never beats cold flank over crisp greens.

Variations worth trying

• Skirt or hanger steak Both swap for flank with similar timing; check 130°F rather than trusting the clock.
• Chicken thighs Use boneless thighs, stretch the marinade to 15 minutes, and cook through to 165°F.
• Add heat A teaspoon of chili-garlic paste whisked into the tamari marinade covers it.
• Extra ginger Double the grated ginger for a sharper marinade; it is a surface treatment, so the effect is immediate.

Frequently asked questions

Why only 5 minutes of marinating?

Tamari is strong and salty, and past 5 minutes it starts to cure the surface of the meat. The short soak seasons the outside, which is all a 15-minute recipe needs.

Can I cook the steak in advance?

Yes. Cook it, rest it, slice it, and keep it refrigerated 3 to 4 days; the salad assembles cold in minutes, and cold flank over greens is how the leftovers get eaten anyway.

No cast iron?

Any heavy skillet preheated to the smoking point works. Light pans lose their heat when the cold steak lands, and the sear turns into a simmer.

What is the temperature target?

130°F for medium-rare, checked with an instant-read thermometer. Flank is lean, and past medium it tightens up fast.

Can I use regular soy sauce?

Yes, one for one. Soy sauce runs slightly saltier than tamari, so taste the greens before adding any extra salt at the end.

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