Heat a large pot with olive oil over medium-low heat. Add sliced onion and cook clow, stirring for 15 mins.
Add the cauliflower, tsp of salt and ½ cup of vegetable stock. Raise the heat to medium, cover and simmer for 15-18 mins
Add the remaining stock, bring to a low simmer and cook uncovered for an addtnl 20 mins.
Working in batches, puree the soup in a blender until very smooth. Once its all blended, transfer back to the pot and let stand for 20 mins to thicken slightly
You may need to reheat the soup slightly before serving. Top with a drizzle of olive oil and cracked black pepper. Serve
Recipe Note
You might like to garnish with chopped roasted almonds and/or fresh thyme.