There are a hundred and one ways to cook laswa. Basically, its just a mix of vegetables seasoned with salt, garlic and onions.
It could come as plain all-vegetables or with seafood like shrimps and crabs.
Commonly used vegetables for making laswa are tagabang (saluyot), kalabasa, okra, sitaw and talong.
Check out this basic Laswa recipe.
Yet this one makes use of kolitis or Chinese spinach instead of the usual tagabang.
Kolitis is very nutritious as it is rich rich in dietary fiber, iron, calcium, phosphorus, riboflavin, niacin and many more.
It also helps prevent from anemia, asthma (just boil the leaves), it has diuretic properties that prevents urinary troubles and diarrhea.
Its high high fiber content helps remove the toxins and eliminate waste easily.
It also contains calcium, phosphorus, and iron which helps in enhancing production of mother's breast milk . Source
Happy Eating!