I tend to find while making things freshly from scratch initially
appears more expensive, it tends to yield a very large portion, meaning you can freeze it, or you do what I do (I hate freezing food) and dish it out to all your uni housemates, and if you're tight you get them to chip in, and the result is a very cheap dish.
For example, I typically buy beef mince, pork mince, pancetta, mirepoix (suffrito - celery, carrots, onions), saute and simmer in tomato paste, then chardonnay, then chicken stock - this then simmers for three hours and you have enough fresh bolognese to feed a large quantity of people, or to save some for the freezer. PS: Don't you dare serve it with spaghetti. Pappardelle is the only way
Beef mince, pork mince, bacon lardons, minced garlic, chopped spring onion, diced red onion, sautéed capers, chives, mixed herbs, paprika, fresh parsley, ketchup, salad cream, balsamic vinegar, Worcester sauce, panko breadcrumbs and an egg all hand-mixed together makes fantastic burgers which are so much nicer than packet frozen ones, and you can again get a high quantity out of these that can be frozen for another day.