You can do a very similar trick with that most student of student foods, packet noodles. You can find vegan packet noodles in most supermarkets - Sainsburys does a couple of kinds for 35p, for example.
If you're lucky enough to be studying at a university in a big city, you'll probably find yourself not too far from a Chinese or other Asian supermarket. They're definitely worth checking out for all the amazing vegan goodies you can find - for example, frozen vegan dumplings. Grab a bag, stick them in the freezer, and the next time you get stuck, you can fish some out and make yourself an effort-free meal.
Case in point: get yourself half a packet of noodles, pour in however much water the packet instructions reckon you need, and then add a some extra veggies - spring onions, greens, carrots, small broccoli florets, whatever - and some of those frozen dumplings. By the time your noodles are cooked through, the dumplings will be warm and tasty, and your veggies are done. You've got a complete meal ahead of you, and you've made both your dumplings and your noodles go further.
If heating something up is a bit much for you, then there is one reliable vegan option for a cold dinner: get yourself down to your nearest Holland and Barrett and check out their own-brand refrigerated stuff.
In their characteristic green and yellow packaging, Holland and Barrett sell loads of pastry based wonders that are suitable for vegans: from porkless pies to meatless Cornish pasties, as well as Jamaican, Italian, Chinese and more inspired delicacies, Holland and Barrett has all sorts of fun stuff.
If you've got a study-heavy period coming up, get a few porkless pies and meat-free sausage rolls, stick them in the freezer, and then when you've not got time to cook, fetch one out and serve it with a salad.
It looks kind of fancy, but this kale, avocado, and fig salad was cheap thanks to my local greengrocer and then porkless pie was bought the last time there was a penny sale at Holland and Barrett for extra cheapness bonus points.