As a vegetarian for over 15 years the only food I continue to miss is prawn toast. Does anybody whether it would be possible to make a vegetarian version and what alternatives to prawn could be used?
This recipe seems to be something close to what you are looking for! http://vegweb.com/index.php?topic=21443.0 Tofu seems to be a reasonable substitute.
However you can also find a vegetarian shrimp substitute through this company: http://www.vegieworld.com/cart/product_pages.asp?id=667
One of their suggested preparation methods is for toast!
There are a lot of vegetarian mock meats out there, but the availability is probably quite variable. May Wah has the largest selection of frozen mock meats I've ever seen and includes prawns: http://www.vegieworld.com/ You could probably use those in your recipe.