I haven't had it for a while, but it used to be Tuna (tin of), pasta, cheese and beans and some chilli powder. Mix the pasta (once cooked) with the pre-heated beans and tuna in a pan, chilli powder to taste, put on a plate, sprinkle grated cheese on top (plenty) and stick under the grill for a while to brown.

It's now changed to...

A tin of tuna, a tin of sweet corn, heated in a pan with a carton of passata, stir into cooked pasta, add some hot sauce to taste. This one we have regardless of financial state.