Had a glut of both and didn't want to do ususal recipes with them. Googled roasting them, got lots of similar recipes:
Put in roasting tin with sliced garlic, drizzle with olive oil and a little lemon juice. Roast at 200-220 for 15-25 mins until tender and a little coloured. Grate over some parmesan and mature cheddar (not loads, just a sprinkling really) lots of black pepper - absolutely divine!
It really intensifies the flavour, the texture is lovely, it doesn't have that slightly watery feel that even steamed broc/cauli does - you really have to try it. Some of the recipes fried breadcrumbs in butter and topped it with that as well as parmesan and fresh chives, but it was fab just as it was.