omelette       
noun [ C ] (US also omelet) uk/ˈɒm.lət/ us/ˈɑː.mə.lət/
A2 煎鸡蛋,煎蛋饼,摊鸡蛋
a dish made by mixing eggs together and frying them, often with small pieces of other food such as cheese or vegetables
  a cheese/mushroom omelette 奶酪/蘑菇煎蛋饼 
 - More examples
 - To make an omelette you must first beat the eggs.
 - I'll have a omelette with fries on the side, please.
 - I think I've just about got enough time to whip up an omelette.
 
Idiom  
you can't make an omelette without breaking eggsidiom  saying 不打破鸡蛋就摊不成蛋饼;有失才有得
it is hard to achieve something important without causing unpleasant effects