400g/14oz broccoli florets (approx. 1 small head broccoli, stem included)
200g/7oz cauliflower florets (approx. ½ small cauliflower)
2 large garlic cloves, minced
1 brown onion, roughly chopped
freshly ground sea salt and black pepper
½ tsp cumin seeds
1 tbsp olive oil
1.2 litres/2 pints vegetable stock