Heat the oven to 200C/180C fan/gas 6. Check the stalks of the broccoli are roughly the same thickness, if not, halve the bigger stems of broccoli lengthways. Rub the broccoli with the oil, then sprinkle over the cumin and some seasoning. Tip onto a baking sheet in a single layer, and roast for about 15-20 mins, or until tender with just a little light charring, turning halfway through.
For the breadcrumbs, heat the oven to 180C/160C fan/gas 4. Tear the bread into small pieces and bake for 5 to 10 mins, or until crunchy, then tip into a food processor and blitz into breadcrumbs.
Heat the oil in a frying pan over a low heat, then add the garlic, spices, the breadcrumbs and some seasoning. Fry, stirring regularly, for about 5 mins until golden. Transfer to a plate lined with kitchen paper to absorb any excess oil.
For the yogurt, mix together all the ingredients and season to taste. Serve the broccoli with the breadcrumbs scattered over and the yogurt on the side for dipping.