Why does oil have to be heated before you put in the mince and oinion?

Heating oil before adding mince and onion helps to create a non-stick surface, allowing the ingredients to brown properly and develop flavor. It also ensures that the oil is at the right temperature for cooking, which can help the meat sear quickly and lock in moisture. Additionally, heating the oil allows the onion to start softening and releasing its flavors before the mince is added.