Idiom Kitchen is a vibrant and engaging project that will introduce you to English idioms, teach you how to express your thoughts correctly and colourfully, and expand your vocabulary. Each episode will introduce you to an English idiomatic expression, its meaning, and how it is used in speech, using amusing and unexpected example sentences.. In this episode, we'll look at the meaning of the interesting idiom 'once in a blue moon' to help you add variety to your English speech and show you how to use it correctly in context.