What was the first food cooked using a microwave oven?

Hints

It starts out much smaller than its final form.
Its preparation involves a sudden change caused by trapped moisture.
It’s strongly associated with movie theatres.

Reveal the answer

Answer: Popcorn

Popcorn was among the earliest foods deliberately cooked during experiments with microwave technology. Percy Spencer, whose observations helped lead to the microwave oven, experimented with popcorn after noticing that microwave energy could heat food.

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