Tip the broccoli stalks into a saucepan, just cover with boiling water and add a generous pinch of salt. Bring to the boil and simmer for 8-10 mins until just tender. Drain, reserving the liquid, then tip into a food processor along with most of the peanuts, garlic, chilli, 1 tbsp lime juice and the 50ml rapeseed oil. Blitz until finely chopped, adding a splash of the cooking liquid if needed.
Add the remaining peanuts and pulse a few times until there is still texture in the sauce. Season to taste, adding more lime juice if needed. Will keep chilled for up to four days.
Heat the oven to 200C/180C fan/gas 6. Tip the broccoli florets and the red onion into the roasting tin with the remaining 1 tbsp oil. Toss together with some seasoning and roast in the oven for 25-30 mins, shuffling the contents of the pan around once or twice, until the broccoli is charred at the edges. Remove and set aside.
Spread the mayonnaise over the base of the focaccia or rolls. Top with the roasted broccoli and onions, spoon over some of the broccoli peanut sauce, top with a handful of rocket and sprinkle over the crispy onions. Add the top half of the bread, squish together and enjoy.
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