First of all you search for the keyword on Google Adwords Keyword Tool and choose exact. Exact means that somebody searches just [chocolate mousse recipe] in Google that doesn’t include other searches like “easy chocolate mousse recipe”. You need to choose to show search volume trends because this way you will know if all the searches are coming from one month or they are evenly spread over the months. As you want a steady income you want to see a fairly even spread over the months. You should get results like this:
As we can see there are about 10,000 searches each month and they are
pretty evenly spread over the months. This is only one part of choosing a great domain name.