Businesses use stem cells taken from an animal and then put those into vats filled with materials like amino acids, nutrients, and sugars. After about three weeks, they take the cells out and make them into recognizable forms that people would be used to buying. The first lab-grown beef burger costs more than $300,000 to create back in 2013. But Valeti said they got that price down to under $2,400 a pound in 2017.