Name: Mint Chutney — Hari Chutney
Prep time: 10 min
Total time: 10 min
Yield: 8 servings
Cuisine: Indian
Ingredients: 2 cups mint leaves; 1 cup coriander; green chilli; garlic; ginger; cumin seeds; lemon juice; ice cubes

Before you cook

Why mint chutney goes brown — and four ways to slow it

Mint and coriander both contain chlorophyll and polyphenol oxidase (PPO) — the same enzyme responsible for cut apple browning. When the cell walls are ruptured by blending, PPO contacts the phenolic compounds in the herb cells and oxidises them to brown quinones within minutes. The browning is accelerated by heat (from high-speed blending), acid (counterintuitively — low pH activates PPO), and oxygen exposure. Understanding this chemistry gives you four tools to slow the browning: ice, low-speed blending, correct lemon timing, and storage without salt.

⚠️Common mistakes to avoid

Blending at high speed for too long — Friction heat from the blender activates PPO faster. Blend briefly in pulses.
Adding lemon juice before storing — Lemon juice preserves colour for immediate serving but accelerates browning in storage. Add just before serving if making ahead.
Not using ice — Blending with ice keeps the temperature below the PPO activation threshold.
Too much coriander relative to mint — Coriander browns faster than mint. The 2:1 mint-to-coriander ratio keeps the chutney greener longer.

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What you need

Ingredients

Mint Chutney — Hari Chutney

8 servings

Chutney

2 cupsfresh mint leaves— packed
1 cupfresh coriander— including soft stems
3green chillies— adjust to heat preference
2 clovesgarlic— optional, omit for Jain
1 inchginger
1 tspcumin seeds— dry-roasted
½ tspsugar
½ tspsalt— add just before serving if storing
2 tbsplemon juice— add just before serving if storing
4–5ice cubes— essential for colour
2 tbspwater— only if needed

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Method

How to make it — step by step

Step 1

Prep and chill — work cold

⏱ 5 min⚡ Cold everything

Wash mint and coriander in cold water. Shake dry. Do not use warm water. Keep all ingredients cold — refrigerate if possible before blending.

🔬The Science

PPO activity is temperature-dependent — it doubles for every 10°C rise. Keeping herbs cold (4–8°C) reduces PPO activity by 60–70% compared to room temperature herbs. Cold herbs entering a cold blender produce a chutney that stays green 3–4 times longer than room-temperature herbs blended in a warm blender. Washing in cold water also removes surface microbes that could accelerate spoilage.

Step 2

Blend with ice — pulse, do not run continuously

⏱ 2 min⚡ Ice cubes + pulse blending

Add all ingredients except lemon juice and salt to the blender with ice cubes. Blend in short pulses — 5 seconds on, 5 seconds off. Scrape down sides between pulses. Blend to a smooth but not liquefied consistency.

🔬The Science

Ice cubes serve two functions: they keep the blender temperature below 15°C (preventing PPO activation from friction heat), and they provide blending liquid without diluting the chutney with water. Pulse blending minimises friction heat — continuous high-speed blending can raise blender contents temperature by 8–12°C, which significantly activates PPO. The intermittent pauses allow heat to dissipate.

Step 3

Season — time the salt and lemon correctly

⏱ 1 min⚡ Timing matters for storage

For immediate serving: add salt and lemon juice, blend 5 seconds more. For storage: add salt and lemon only at the point of serving. Store plain blended chutney in an airtight container in the refrigerator.

🔬The Science

Salt draws moisture from the herb cells through osmosis, which carries chlorophyll out of the cells and exposes it to oxygen — accelerating browning. Lemon juice acidifies the chutney — while acid below pH 3.5 inhibits PPO, at the typical chutney pH of 4.0–4.5, acid actually enhances PPO activity. For storage, keeping the chutney unsalted and un-acidified maintains a more neutral pH that slows both PPO and chlorophyll degradation. Add both only at serving.

Common questions

Mint Chutney — Hari Chutney — answered

How long does mint chutney last?

Without salt and lemon: 3–4 days refrigerated in an airtight container, staying green. With salt and lemon: 1–2 days, browning progressively. Frozen in ice cube trays: up to 3 months. Freeze without salt and lemon, add both after thawing.

Why does restaurant mint chutney stay so green?

Most restaurant chutneys contain a small amount of spinach or coriander paste, which has more stable green compounds. Some add a pinch of baking soda (raises pH, slows PPO) or store under a thin layer of oil (oxygen barrier).

What is the correct herb ratio for mint chutney?

2:1 mint to coriander by volume. More mint produces a sharper, more pungent chutney. More coriander produces a herbaceous, sweeter result — and browns faster. Adjust to taste but stay above 60% mint for best colour stability.

Can I add yogurt to mint chutney?

Yogurt mint chutney (dahi pudina chutney) is a common variation — adds creaminess and extends shelf life slightly (the yogurt's casein provides some PPO inhibition). However it changes the dish from a chutney to a dip.

What is mint chutney used for?

Samosa, pakora and bhajia dipping; sandwich spread (the classic Mumbai sandwich chutney); chaat accompaniment; served alongside biryani; and as a marinade base for tikka preparations.