Cook the rice the night before or 2-3 hours before to allow it to dry out. This will make it easier to crisp up the rice.
Preheat the oven to 220C/428F. Line a large baking tray.
Blend all the ingredients for the curry paste in a small blender until smooth. Taste and adjust according to your preferences, noting that the chilli gets a bit more muted once it cooks on the rice.
Combine the rice and curry paste until the rice is completely coated. I like to do this in a large bowl for ease.
Bake the rice in 20 minute increments, tossing it to encourage even cooking. I like to cook my rice for 1 hour or even 1 hour 20 minutes, tossing every 20 minutes, so it becomes super crispy. It will soften a little when the dressing is added.
While you’re waiting, make the nuoc mam. Combine the sugar and boiling water and allow the sugar to dissolve. Add the lime juice and vegetarian fish sauce and adjust according to your tastes. Set aside.
Once the rice is super crispy, remove it from the oven and allow it to mostly cool. Pouring the dressing over hot rice will make it lose it’s crispiness quickly.
Once mostly cool, transfer the rice to a large serving platter. Add the cucumbers, chopped herbs, peanuts and (optional) spring onion greens and stir to combine.
Pour over the nuoc mam and serve. Leftovers keep well in an airtight container in the fridge for a number of days.