Start by preheating your oven to 220C to roast your cauliflower.
Toss the cauliflower florets with the oil, spice and salt and pepper in a large bowl. Arrange on a lined baking tray, then place in the oven to bake until tender and browned – around 18 to 20 minutes – turning half-way through cooking. Set aside to cool completely.
To make your mint yoghurt, simply stir together all ingredients, then place back in the fridge until ready to use.
Make your chaat by tossing together the cauliflower with the remaining ingredients, seasoning to taste if needed.
Serve in bowls with spoonfuls of mint yoghurt and eat immediately.