Fruits are usually trickier, but the one time I bought pineapple I cut it into thin slices and stored them in a airtight tiffin box. Oranges and things can be peeled immediately and eaten, but peeling and chopping a pineapple or melon when one takes a fancy to it is tough. Much easier to clean them out and store them in neat, immediately-edible forms.
Broccoli, mushrooms, green beans. Pork chops.
Onions, ginger, green chillies, lemon. The sticky plastic wrap I use.