Group · Vegetables
Kombu seaweed
Kombu seaweed is one of the large brown algae used for centuries in Japanese cooking. It is found mainly dried, in wide strips, but also dehydrated as a powder or flakes. Known for its deep umami taste, it is used above all to flavour broths and to tenderise pulses. With only 43 kcal per 100 g, around 1.68 g of protein, 9.57 g of carbohydrate and 0.56 g of fat, kombu remains a low-calorie ingredient, rich in minerals and iodine. Its place in a balanced diet comes mainly from its role as a natural flavour enhancer, which lets you reduce added salt while making the most of the aromatic richness of your plant-based and seafood dishes.
Macronutrient breakdown
Nutrition table per 100 g
| Calories | 43 kcal |
| Kilojoules | 180 kJ |
| Protein | 1,7 g |
| Carbohydrate | 9,6 g |
| Fat | 0,6 g |
| Fibre | 1,3 g |
Tips
Kombu is mainly used dried. Before cooking, wipe it without rinsing it to keep the thin white film on the surface, which concentrates the umami. The best-known preparation is dashi, a Japanese broth made by steeping a piece of kombu in simmering water, without bringing it to a hard boil to avoid bitterness. This broth is the base for soups, miso and slow-cooked dishes.
Another valuable use: add a strip of kombu to the cooking water of pulses. This makes them easier to digest and shortens the cooking time. For minerals, kombu provides iodine, calcium, magnesium and potassium, as well as fibre that contributes to fullness. As its iodine content is high, it is best eaten in moderation and in small amounts, especially if you are monitoring your iodine intake.
To vary things, you can also combine it with other seaweeds such as wakame or nori seaweed, which offer complementary textures and flavours. In a salad, rehydrated kombu goes well with a little sesame, some rice vinegar and crunchy vegetables such as cucumber.
- Portion: a few grams are enough, as kombu is very concentrated in flavour and minerals.
- Gentle cooking: choose steeping and simmering rather than hard boiling.
- Storage: keep it dry, away from light and moisture in an airtight jar.
- Salt reduction: use its natural umami to salt your broths less.
For active people, kombu is useful as a mineral seasoning in recovery dishes. Added to a vegetable broth after exercise, it contributes to rehydration and to potassium intake, useful after sweating. However, it provides only a little carbohydrate and protein: it accompanies, but does not replace, the energy sources in your post-workout meal. To go further on balancing meals around exercise, see our guidelines on nutrition for fitness.
For weight loss, its almost negligible calories and strong aromatic power make it an ally for boosting light dishes without weighing down the calorie bill. Discover more ideas in our section on vegetables to put together tasty, balanced meals.