Cut the cauliflower into florets and pulse in a food processor until it resembles rice grains — about 10–15 pulses. Don't over-process or it becomes mushy. Heat the sesame oil in a large skillet over medium-high heat. Add the cauliflower rice and cook for 4–5 minutes, stirring frequently, until tender and lightly golden. Add the low-sodium soy sauce and toss well. Set aside and keep warm.
Bring a small saucepan of water to a boil. Gently lower the eggs in and cook for exactly 6.5 minutes. Transfer immediately to a bowl of ice cold water for 2 minutes. Peel carefully and set aside.
Heat the sesame oil in a large skillet over medium heat. Add the minced garlic and cook for 1 minute until fragrant. Add the julienned carrot and cook for 2 minutes. Add the julienned zucchini and cook for another 2 minutes. Add the spinach and cook for 1–2 minutes until just wilted. Add the low-sodium soy sauce and sesame seeds, toss well and remove from heat.
In a small bowl whisk together the white miso paste, sesame oil, rice vinegar, water, and black pepper until completely smooth. Add water one teaspoon at a time to reach a pourable consistency.
Divide the cauliflower rice between two wide bowls. Arrange the cooked vegetables in separate sections around the bowl. Slice the soft boiled eggs in half and place in the centre. Drizzle the miso sesame sauce generously over everything. Scatter spring onion greens and sesame seeds over the top. Serve immediately.