Heat the rapeseed oil in a large frying pan and fry four pieces of cauliflower on each side until golden brown. Remove from pan and repeat with the remaining four pieces. Put the cauliflower in a large bowl, pour in the olive oil and garam masala, toss to ensure a good coating on all sides, then tip the cauliflower on to a large roasting tray and bake for eight to 10 minutes.