You don't need protein in every meal.
Loads of stir fried veggies plus tinned pineapple, sweetcorn, wraps, (sometimes with handmade salsa and guacamole when in season). If hungry then add a tin or two of beans. As a student I used to have it without beans but DH likes the bulk and it goes further with two/three people.
I used to do the same with pasta, just shed loads of veggies and a tomato sauce. Add sausages for DH now, but I don't like processed stuff that much.
Chickpea and spinach morrocan stlye tomato sauce with couscous. I brought a jar once, looked at the ingredients and have always made my own since (I don't like jar sauces anymore)
spicy bean thing for when I'm lazy. Only time I use tin tomatoes actually. Fyr an onion and garlic, add packet of bombay potato spice mixture, add tomatoes, add 2 x tinned beans, add lemon (and maybe coriander if have some). Cook rice.
Another quick one is penne pasta, pan fried spinach and fried/oven roasted pine nuts (sometime with oven roasted tomatoes as well). There's enough oil with the spinach to stir in the pasta. VERY filling actually.
Bruschetta is a favourite saturday lunch treat here. Boil tomatoes, peel, chop, stir in salt, pepper, basil and oil. (leave in fridge if done in advance). French stick sliced and toasted both sides. Rub in raw garlic one side, drizzle olive oil, spoon tomato mixture on top. A dinner's plate worth does me and DH.
Lentil cottage pie, very yummy. Sometime par boil root veggies first. I don't use stock as I feel I have enough veggies to half make one. I don't use tomatoes either, unless have some fresh knocking around. I find with tinned tomatoes you have to add tons of herbs to get a flavour. (I tend to use only fresh herbs as well)
well that was a bit long