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Heat the oven to 200C/180C fan/gas 6. Pull the leaves off the cauliflower and cut off the base, then slice into 2cm-thick steaks. Mix the oil with the curry powder. Lay the cauliflower steaks on a flat baking tray lined with foil. Brush each one generously with the curry oil on both sides, and sprinkle with salt before roasting for 25-30 mins until tender.
In a bowl, mix together the tomatoes, onion, coriander and a pinch of salt. In a second bowl mix together the mayonnaise, yogurt and curry paste.
Toast the buns cut-side down in a dry frying pan. Top each bun with a dollop of curried mayo, the cauliflower steak, some more curried mayo, the tomato and onion mix and some bombay mix, if you like.