Is there any meditation technique to develop the feeling of Gratitude?

It has occurred to me that if I have a sense of gratitude towards life and towards what has already been given to me then it's not possible to develop desires. I don't know why gratitude is not one of the Brahmaviharas. Lot has been said about it by the Buddha. I was looking for any technique to develop gratitude towards life or in general. What I was trying was to say, "I am grateful for what has been already given". but it's becoming like a mantra and proving useless. Is there any technique to generate the feeling/emotion of gratitude? I looked at this question , but the answer I am looking for isn't there.