Buta to Yasai no Amazu Itame (Japanese Sweet-and-Sour Pork & Vegetable Stir-Fry)

This is the kind of stir-fry I make on a Wednesday evening when I want something deeply savoury, a little sweet, and on the table in 15 minutes. Thinly sliced pork, julienned carrot, onion, and green pepper, all tossed in a glossy sweet-and-sour soy glaze and served over rice. It’s not Chinese sweet-and-sour pork — there’s no ketchup, no thick cornstarch sauce, no battered pieces. This is the Japanese home-cooking version: lighter, soy-forward, with a clean rice vinegar tang that wakes everything up.

The technique is fast and forgiving. The only trick is dusting the pork with potato starch before frying — it gives every slice a thin, silky coating that catches the sauce. Once you’ve done that, the whole thing comes together in 10 minutes of actual cooking.

Japanese Sweet-and-Sour vs. Chinese Sweet-and-Sour

If “sweet and sour” makes you think of bright red Chinese takeout, this dish will surprise you. The Japanese home-cooking version (called amazu itame 甘酢炒め — literally “sweet vinegar stir-fry”) tastes nothing like that.

• No ketchup — the colour is brown, not red.
• Soy sauce-based — savoury depth is the foundation, not just sweetness.
• Rice vinegar instead of malt vinegar — milder, cleaner, more aromatic.
• Stir-fried, not deep-fried — the pork is thin sliced and tossed in the pan, never battered.

The result is something you can happily eat several times a month without it feeling heavy. It’s a weeknight standard in Japanese homes for exactly that reason.

Ingredients

Serves 2

For the Stir-Fry

Ingredient	Amount
Thinly sliced pork (komagire or any thin-sliced pork)	200g
Potato starch (katakuriko)	About 1 tbsp, for dusting
Onion, thinly sliced	1/2 (about 100g)
Carrot, cut into thin matchsticks	1/2 medium (about 60g)
Green pepper, cut into thin strips	1 (about 50g)
Sesame oil	1 tbsp
Garlic paste (or 1 clove minced)	1/2 tsp
White sesame seeds (optional)	To finish

For the Sweet-and-Sour Sauce

Ingredient	Amount
Sugar	2 tbsp + 1 tsp
Soy sauce	1 tbsp
Sake (cooking rice wine)	1 tbsp
Mirin	1 tbsp
Rice vinegar	1 tbsp

For the pantry staples I use:

• 👉 Japanese soy sauce on Amazon
• 👉 Japanese mirin on Amazon
• 👉 Japanese sesame oil on Amazon
• 👉 Potato starch (katakuriko) on Amazon

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How to Make Buta to Yasai no Amazu Itame

Step 1: Prep the Vegetables and Mix the Sauce

Slice the onion thinly. Cut the carrot into thin matchsticks (julienne) — keep them thin so they cook quickly. Cut the green pepper lengthwise into thin strips.

Pro tip: the original recipe microwaves the carrot for 3 minutes at 600W before stir-frying. This is a great shortcut — it makes the carrot tender quickly and ensures it absorbs the sauce instead of staying crunchy. If you’re short on time and skip it, just cut the carrot a little thinner.

In a small bowl, mix the sauce ingredients: sugar, soy sauce, sake, mirin, and rice vinegar. Stir until the sugar dissolves. Having the sauce ready before you start the pan means you can move fast at the end.

Step 2: Dust the Pork with Potato Starch

Lay the thinly sliced pork on a plate and sprinkle about 1 tbsp of potato starch evenly over it. Toss gently with your hands so every piece gets a light coating. Don’t dump it on in clumps — a fine even dust is what you want.

This single step makes a big difference. The starch creates a silky coating on the pork that holds the sauce against each slice, instead of letting it pool at the bottom of the pan. The pork ends up glossy, tender, and properly seasoned.

Step 3: Stir-Fry the Pork

Heat 1 tbsp sesame oil in a wide frying pan over medium-high heat. Add the garlic paste, swirl for a few seconds until fragrant, then add the pork in a single layer.

Let the pork sit untouched for about 30 seconds to start browning, then stir-fry until about 90% cooked through — most of the pink is gone but there are still a few raw spots. About 2–3 minutes.

Step 4: Add the Vegetables

Add the carrot, onion, and pepper to the pan with the pork. Toss everything together over medium-high heat for 2–3 minutes until the onion turns translucent and any extra moisture from the vegetables cooks off. You want the pan dry, not steamy — extra liquid will dilute the sauce.

Step 5: Add the Sauce

Lower the heat to medium-low. Pour in the premixed sauce. Toss everything together so each piece gets coated, and continue cooking for 1–2 minutes until the sauce thickens slightly and clings to the pork and vegetables. The potato starch on the pork will pull the sauce into a glossy, light glaze.

Taste — if you want a little more tang, add a tiny splash of extra vinegar; if it needs more punch, a few drops of soy sauce.

Step 6: Serve

Plate immediately and sprinkle with white sesame seeds. Serve hot over steamed rice — the sauce is meant to mingle with the rice, so don’t skimp on it.

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Tips From My Kitchen

• Dust the pork in starch. Don’t skip this. It’s what gives the sauce something to grip and turns thin pork slices into something that tastes like proper restaurant stir-fry.
• Mix the sauce before you start cooking. Once the vegetables are in the pan, things move fast. Having the sauce in one bowl means you can pour and toss without losing momentum.
• Cut the carrot thin. If your carrot is in chunky matchsticks, microwave it for 3 minutes first or it’ll stay crunchy when the rest is done.
• Use sake — it matters. A tablespoon of cooking sake brings depth that’s hard to fake. Dry white wine works in a pinch but sake is better.
• Any thin-sliced pork works. Pork komagire (off-cut scraps), thin-sliced belly, thin-sliced shoulder — all good. Just slice it thin if you’re starting with a thicker cut.
• Eat it the same day. Stir-fries don’t reheat well — the vegetables go limp. If you have leftovers, eat them cold on top of rice the next day for lunch.

What to Serve With Buta Amazu Itame

• Steamed white rice — essential. The sauce is built to mix into rice.
• Miso soup — a simple tofu and wakame miso soup balances the sweet-tangy stir-fry.
• A light side — nasu no yakibitashi or a simple sunomono (cucumber vinegar salad) is a refreshing contrast.
• Cold tofu (hiyayakko) — minimal effort, cools the palate between bites.

Variations

• Add bell pepper of different colours — red and yellow peppers make the dish more colourful for the same flavour.
• Add bean sprouts (moyashi) — toss in a handful at the end for a satisfying crunch.
• Add ginger — a teaspoon of grated ginger along with the garlic adds warmth.
• Make it spicy — a pinch of shichimi togarashi or a few slices of fresh chili for heat.
• Use chicken instead — thin-sliced chicken thigh works beautifully with the same sauce.