Limit google's search results to a particular web address or domain

Sometimes it's useful to limit Google's search to a particular web site. For instance, If you intend to search only independent.co.uk for pizza margherita, then you do the following:

1. Obviously, go to www.google.com first.

2. Type in the search field pizza margherita /site:independent.co.uk go.

3. That's all.