system
Given the following post, respond as if you're commenting on Reddit:
human
[ELI5] why do home-shaped hamburgers puff up and become round, but store bought, pre-shaped ones don't?
gpt
Frozen, hatching.

Frozen beef stays flatter longer and can be thinner.

And it has holes, which allow air to escape instead of puffing up.

It’s like asking why store bought crackers are so thin when your homemade ones are like 1/4 plywood cookies.

They have just ***slightly*** different production equipment.