[Fridge] Corn tortillas (can also be frozen) [Freezer] Old bananas. If you have a banana too spotted to eat during the week, just put it in the freezer for later use in banana bread. (You can freeze it right in the peel, unwrapped). [Pantry] 
Canned tuna or salmon
C a n n e d b l a c k b e a n s
C a n n e d g a r b a n z o b e a n s
P o t a t o e s
C a n n e d t u n a o r s a l m o n
P a s t a
C a n n e d c h i l i