Step by step

On the second slice of bread, arrange a few raspberries, then finish with the third slice of bread and put in the oven

If you want to turn your club sandwich into a meal, you can serve it with some American-style coleslaw or potato salad, or even with French fries.
The club sandwich is rather like its cousin the BTL (bacon - tomato - lettuce) and our national Italian sandwich. Its origins seem to be reasonably historic: it appears that it was invented in a gambling club in New York at the end of the 19th century. At the time it was called a ‘clubhouse sandwich’ and is now called simply a "club sandwich’.