Meanwhile, steam the cauliflower for 4 mins, then add the spring onions for 3 mins more or until tender. Pat dry, then toss the veg in 2 tsp olive oil and season. In a large frying pan, toast the bread pieces in the remaining oil, then add the chilli and garlic, and cook for 1 min. Tip into a food processor with the nuts, peppers, tomato and vinegar, and pulse until you have a rough paste. Season and put to one side.