Preheat oven to 200°C (400°F). In a large bowl, combine the cauliflower, 15ml (1 tablespoon) of olive oil, 1 teaspoon of garam masala and a generous amount of salt and pepper. Toss to combine and transfer to a parchment-lined baking sheet. Roast cauliflower for about 30 minutes, or until very tender and browned.
About 10 minutes before the cauliflower is done, add remaining 15ml of olive oil to a large saucepan over medium heat. Heat until shimmering and add shallots. Saute shallots until softened and translucent, about 5-10 minutes.
Add 2 teaspoons of garam masala, cumin and chili flakes to the shallots. Cook until very fragrant, about 30 seconds, before adding the garlic and cooking for a further 30 seconds.
Pour over vegetable stock and bring to a gentle simmer. Add roasted cauliflower to the jar of a blender and pour over vegetable stock mixture. Blend on high for about 1 minute or until completely smooth.
Pour pureed soup back into the pot, set over medium heat and bring back to steaming. Stir in lemon juice. Taste to adjust for seasoning, adding salt and pepper where needed. Serve.
Video
Notes
For best results, use unsalted stock so you can control the seasoning of the final dish.
Make Ahead
Store in an airtight container in the fridge for up to 3 days or freeze for up to 3 months. Defrost overnight in the fridge and reheat gently in a pot over medium-low heat, stirring occasionally, until hot. Add a splash of water or stock if it has thickened.