When a mate and I lived in Edinburgh together and were very broke we would buy a huge sack of rice, some veg and cheese and pretty well ate the same thing each day for the month. We became so bored with it we used food colouring to spice it up visually. We were also ingesting quite a lot of cheap buy very effective lsd.
It all became a bit much.

Mind you, not that much further in the future and still in Edinburgh a few of us, again sharing a flat, were again so broke that we actually couldn't buy food. We did however have all the condiments. We made a soup using salt, pepper, ketchup, hot water and...green, ultra absorbent economy toilet paper as a thickener.

It was indeed filling if not particularly nutritious.