Heat oil in a wok on high. Add the prawns. Stir-fry for 1-2 minutes, tossing constantly until prawns start turning opaque.
Add garlic. Toss and cook for 30 seconds until garlic is fragrant and starting to turn golden.
Add gai lan and cabbage. Stir-fry for a minute until veggies start wilting.
Add cooked noodles, kecap manis, soy sauce, oyster sauce and sambal olek. Toss and mix well. Cook for 1-2 minutes until everything is evenly coated and heated through.
Remove from heat. Serve hot.
Notes
A note on seasoning - There is enough salt in this recipe from the various sauces and the cooked noodles. But it is always good to taste the dish and adjust the seasoning. Very often, I find that a little pinch of salt at the end is needed to elevate the taste of the Hokkien noodles.Hokkien noodles - These are thick, chewy, wheat noodles. They are found cooked and packaged in cold/fridge section of Asian supermarkets. You can substitute with lo-mein/chow-mein/egg noodles or udon noodles. Udon noodles are the best substitute.Gai lan - This is a dark green, leafy Asian vegetable. You can substitute with choy sum, bok choy or broccoli rabe.Sambal Oelek - This is an Indonesian chilli paste. It is very spicy and made of red chilli peppers. You can substitute with Sriracha or Chinese chilli oil.Oyster sauce - This can be substituted with vegetarian oyster sauce or hoisin sauce.Kecap manis - This is an Indonesian dark soy sauce. It is thick, sweet and salty. Closest substitute would be light soy sauce and honey or maple syrup.Prawns - Use raw prawn meat for this recipe. If using cooked prawns, add them at the very end to avoid them becoming chewy and overcooked.Storage - Cooked noodles keep well in the fridge in an air-tight container for up to 3 days. Freezing is not recommended.