Pierce a few holes in the top of the coconut. Drain the juice by tipping it up over a jug. Break the coconut. (This is best achieved by hitting it with a hammer on a solid stone floor). Scoop out the soft flesh and set aside.
Trim the cauliflower of all its outer leaves and cut into small pieces (5cm wide).
Add cauliflower to a vegetable steamer and steam until tender (10-15 mins). In a food processor blend the cauliflower with the coconut flesh and lime juice, adding the coconut juice a little at a time until smooth. Season with salt and pepper, Stir through the mint.