Sit down on a chair, pick a fruit of your choice, and hold it out in your palm. Now completely concentrate on the fruit. Run your eyes over it, think about its smell, visualize in your mind its taste, the texture, the sensation of biting into it etc. Do not think about the ancillary matters like the price, the store from which you bought it etc. The idea is to block out every other thought from your mind and think about the fruit at the most elementary level.

Please refer to the book for more details on this activity.