Step 1

Trim all of the florets from the cauliflower and cut into chunky pieces, keeping back 2 of the nicer florets for later. Finely chop the stem.

Step 2

Heat the vegetable oil in a large pan and cook the chopped cauliflower florets and stem with the onion over a medium heat for 10 minutes, stirring regularly, until the cauliflower is deeply golden. Tip in the garlic and cook for 2 minutes, then add the curry powder and cook for 1 minute. Pour in the vegetable stock and simmer for 20 minutes until the cauliflower is starting to break down. Stir through the yogurt, then use a stick blender to whizz until completely smooth.

Step 3

Use a sharp knife or mandoline to very thinly slice the 2 cauliflower florets you kept back. Gently toss them with a little seasoning and the lemon juice. Pour the soup into bowls and top with the thinly sliced cauliflower, and a grinding of black pepper, if you like.