Put the rice into a pan with a pinch of sea salt, cover with 640ml of boiling water and cook on a medium heat for 10 to 12 minutes, or until cooked through. Tip the rice onto a large tray and spread out into a thin layer to steam and cool completely. Or, you can simply use up leftover rice from the day before, which is even better (see Notes).
Meanwhile, make the pickle - put the cucumber slices in a bowl with half of the chopped coriander stalks. Add a good few swigs of rice vinegar, the lime zest and juice, and caster sugar, then season with salt and freshly ground black pepper, and toss together well.
Place a large heavy-bottomed pan or wok on a high heat, add the groundnut oil, then add the onion, garlic, ginger, chilli, remaining coriander stalks and palm sugar. Stir-fry for a few minutes, then add the sugar snap peas, broccoli and cooled rice and continue cooking for 3 to 4 minutes, or until the rice is hot through, tossing regularly. Stir in the kecap manis and a few shakes of fish sauce to season, then turn the heat off. Place a quarter of the rice in a small bowl, push down to compact, then turn out onto a serving bowl plate. Repeat with the remaining rice.