I am a food that explodes. But long before I explode, I am already dead. I can be small, I can be big, and I can be fragrant. My name is literal. What am I?

Riddle: I am a food that explodes. But long before I explode, I am already dead. I can be small, I can be big, and I can be fragrant. My name is literal. What am I?

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Popcorn.