Method

1. Preheat oven to 200 degrees (180 fan). Toss the cauliflower with enough coconut oil to lightly coat it (up to 3 tablespoons). Spread the cauliflower in a single layer on a large baking sheet and roast until the tips of the cauliflower are golden brown, about 25 to 30 minutes.
2. In a large, heavy-bottomed pot over medium heat, warm 1 tablespoon of the coconut oil until shimmering. Add the onion and a dash of salt and cook, stirring occasionally, until the onion is turning translucent, about 3 minutes. Add the curry paste and lemon zest and stir to incorporate. Raise the heat to medium-high, add the wine, and cook, stirring frequently, until most of the wine has evaporated.
3. Add all of the roasted cauliflower stems and half of the florets to the pot. Add the vegetable broth, coconut milk and sugar. Bring the mixture to a gentle simmer, stirring occasionally. Continue simmering for 5 to 10 more minutes to meld the flavors, reducing heat as necessary to maintain a gentle simmer. Remove the pot from the heat.
4. Let the soup cool for a few minutes, then carefully use an immersion blender to blend until smooth. (Or transfer the soup in small batches to a blender, blending until each batch is smooth. Don’t ever fill your blender past the maximum fill line, and beware of the steam escaping from the lid.)
5. Stir in 1 teaspoon vinegar and salt and pepper, to taste. If the soup needs more acidity, stir in 1 to 2 additional teaspoons of vinegar, to taste. Ladle the soup into 4 bowls.
6. Top each with ¼ of the cauliflower florets, a sprinkle of basil and chives and hot peppers (if using).