I live in catered halls (well, until thursday!) and I was served a medium portion of veggie stir fry (peppers, onion, babycorn) but it was in a oily sauce and I cannot ask what it was cooked it cos I would've just look stupid!
Well veg oil is 1 point per tsp. It depends on how big your medium portion looked. You could over estimate and go for 2.5? I have no idea unless I see it. Sorry, not much help.