<human>:  How do I make mozzarella cheese from scratch?
<bot>: To make mozzarella cheese from scratch, you will need to start with a gallon of whole milk. Heat the milk in a stainless steel pot to 90°F, then add citric acid and let it sit for 10 minutes. Next, add rennet and let it sit for 5 minutes. After that, gently stir the curds that form and gently heat them to 110-115°F while stirring. Drain the curds and cut into small pieces, then slowly heat the curds again to 135°F while stirring the curds. Finally, stretch and knead the curds until they form into a shiny, creamy mass, then shape it and serve.