Celeriac's good with mashed potato and a peeled, unchopped garlic clove (2" chunks boiling for same times as pots, then mashed - better 'mashing' with electric whisk to get it fine; butter, milk)
Roasted veg - butternut squash (just peel and cube), red onion (large chunks), unpeeled garlic, rosemary, olive oil to smother (can also used cubed celeriac and parsnips, or red/yellow peppers) - 200C for 45min.
Supermarket Bag of Spinach (check its pre-washed) - pierce couple of holes in bag, nuke for 1-2min, open bag and plonk in a wodge of butter, salt and pepper. Jiggle bag around and serve.
Mashed swede and carrots. Vaguely overboil carrots and swede so soft. mash with lots of butter and pepper.
Curly kale nice too - just steam. Strong irony taste.
Buttered leeks. Fry leeks slowly in butter until just soft.
Leek and mushroom bake - Fry chopped leeks and mushrooms until soft, add glass of wine, simmer down to 2/3 less volume, put veg in ovenproof dish, add good portion of gruyere and covering of breadcrumbs - 200C 30min.
Spring veg gratin - Boil/steam different veg (whatever takes your fancy - carrots, parsnip, cauli, broc) until just cooked, cover with tub of creme fraiche with tbsp of wholegrain mustard and 2 handfuls of gruyere. Bake 200C 30min.
Savoy cabbage - steam/boil. In frying pan fry off some pancetta and garlic. Once cabbage cooked mix all together.
Roasted Beetroot - (fresh not pickled) - no need to peel, just quarter or half put in foil 'bag' with splash of balsalmic vinegar and olive oil - in oven 200C think its 30-40min. Its a Jamie recipe - might be able to google.