Photo: Do not plant the fleshy part of the fruit or you will risk the roots rotting
Update: Just plant the green top part of the pineapple in the soil or you risk the root rotting. Being careful not to hurt your hand, grab the base of the green top and twist. The green top should easily twist off. Then remove leaves from the bottom inch (or two inches) of the stem. Plant the exposed stem in potting soil and water thoroughly. Place the plant in a shady place, and keep watering your plant. The plant will take root. The outer leaves will eventually brown and die, but new leaves will form in the center, and eventually the plant will produce small pineapple fruit.
Grow a pineapple plant from the top of a pineapple head!
Last Saturday, I had a craving for an "island" burger, which is really just a normal cheeseburger with a nice slice of grilled pineapple. I had everything to make the burger except the pineapple so I had to ask myself, did I really want an island burger? It turns out I did so I made a trip to the grocery store for a whole pineapple and some other munchies.
As I was firing up the grill, an idea in one my gardening books jumped out at me---I should try and plant that pineapple head. According to this book, you can grow a whole new pineapple plant from the top of a pineapple head. You should plant a pineapple head that is not too ripe, and has leaves that are still green.
My pineapple head's leaves were only partially green so I am curious to see if it still works. For detailed instructions on planting a pineapple head, you can click here.