Combine the kecap manis, sugar and fish sauce in a glass or ceramic bowl. Add pork. Stir to coat. Set aside for 15 minutes (or up to 1 day) to marinate.
Drain pork from marinade, reserving marinade. Heat 1 tsp of the oil in a wok over high heat. Add half the pork. Stir-fry for 1-2 minutes or until browned. Transfer pork to a bowl. Repeat with 1 tsp oil and remaining pork.
Heat remaining oil in wok over high heat. Add onion and broccolini stems. Stir-fry for 1 minute. Add broccolini florets, ginger, garlic, lemongrass and chilli. Stir-fry for 30 seconds or until aromatic. Add reserved marinade and stir-fry for 1 minute or until vegetables are tender-crisp. Add the snow peas and reserved marinade. Stir-fry for 30 seconds. Add zucchini noodles. Stir-fry for 1 minute or until well combined and just tender. Remove from heat.
Stir through half the Thai basil. Serve with lime halves and sprinkle with remaining Thai basil.
