Light soy sauce and dark soy sauce are two different condiments that serve different purposes in Asian cooking. Light soy sauce is thin, salty, and used primarily for seasoning and flavour. Dark soy sauce is thicker, less salty, slightly sweet, and used mainly to add rich colour to dishes. Most Asian recipes that call for "soy sauce" without specifying mean light soy sauce.
What Is Light Soy Sauce?
Light soy sauce (also called thin soy sauce or regular soy sauce) is the most commonly used soy sauce in Asian cooking. It is made from fermented soybeans, wheat, water, and salt. It has a thin, pourable consistency and a strong salty flavour with umami depth.
Key characteristics:
- Thin, watery consistency
- Strong salty flavour
- Light brown colour
- Used for seasoning during and after cooking
- The default "soy sauce" in most recipes
What Is Dark Soy Sauce?
Dark soy sauce is aged longer than light soy sauce and often has added molasses or caramel. This gives it a thicker consistency, darker colour, and slightly sweet flavour. It is less salty than light soy sauce and is used primarily to add colour and richness to dishes.
Key characteristics:
- Thick, syrupy consistency
- Less salty, slightly sweet
- Very dark brown, almost black
- Used for colour in braised and stir-fried dishes
- Never used as the only soy sauce in a recipe
Light vs Dark Soy Sauce - Quick Comparison
| Light Soy Sauce | Dark Soy Sauce | |
|---|---|---|
| Colour | Light brown | Very dark brown/black |
| Consistency | Thin and pourable | Thick and syrupy |
| Saltiness | Very salty | Less salty |
| Sweetness | Not sweet | Slightly sweet (molasses/caramel) |
| Primary use | Seasoning and flavour | Colour and richness |
| Amount used | Tablespoons | Teaspoons (a little goes a long way) |
When to Use Light Soy Sauce
- Stir-fries - the main seasoning sauce
- Marinades - for meat, seafood, and tofu
- Dipping sauce - mixed with vinegar, chilli, or sesame oil
- Soups and broths - for salt and umami
- Fried rice - the primary soy sauce used
- Dressings - for salads and cold dishes
When to Use Dark Soy Sauce
- Braised dishes - gives meat that deep mahogany colour
- Char kway teow - essential for the dark colour
- Lo mein and chow mein - colours the noodles
- Red-cooked dishes - Chinese braised pork belly, soy chicken
- Fried rice - a small amount for colour (alongside light soy)
Can You Substitute One for the Other?
They are not interchangeable. If a recipe calls for dark soy sauce and you only have light, your dish will lack colour and look pale. If you use dark soy sauce where light is called for, your dish will be too dark, too sweet, and not salty enough.
The best approach is to keep both in your pantry. Light soy sauce is used much more frequently, so buy a larger bottle. Dark soy sauce is used in smaller quantities, so a smaller bottle will last longer.
What About Kecap Manis?
Kecap manis is Indonesian sweet soy sauce, which is different again. It is much thicker and sweeter than dark soy sauce, with a molasses-like consistency. It is used in Indonesian dishes like nasi goreng and satay. It is not a substitute for either light or dark soy sauce in Chinese cooking.
Popular Soy Sauce Brands in Australia
- Kikkoman - Japanese style, excellent all-rounder for light soy sauce
- Lee Kum Kee - popular Chinese brand for both light and dark
- Pearl River Bridge - widely used in Chinese restaurants
- Healthy Boy - Thai brand, great for Southeast Asian cooking
- Yeo's - Malaysian brand, popular for dark soy sauce
Where to Buy Soy Sauce in Australia
Asian Pantry stocks a wide range of light and dark soy sauces from all the major Asian brands. Browse our sauces collection to find the right soy sauce for your cooking. We deliver Australia-wide from our Melbourne warehouse.