In the Paleolithic Age, most of the cooking methods they used were? Roast? After all, this method is very simple, just need fire and ingredients, and this process alone has lasted for nearly tens of thousands of years. Although iron appeared in the Spring and Autumn Period and the Warring States Period, after all, the output of iron at that time was far from meeting people's needs, so at that time, iron was still very precious. Rare things like iron pots only appear in the palace, which also leads to the fact that ordinary people must not have seen them.
However, although there were few ironware, in the Qin Dynasty, they still had their own containers, such as pots and pans. When using this container, they also restricted the variety of ingredients and could only cook porridge or something. Anyway, at that time, the diet of the Qin Dynasty was still very simple, but there were very few kinds of food they could eat, even though it was difficult for them to eat common vegetables and fruits often.
Therefore, in the era when there were no pots and pans, Qin people cooked food on fire at most. At that time, people often went out hunting, and they also ate some game to satisfy their hunger. However, in most cases, people don't have animal products on the table, so their lives are not as good as we thought, nor as good as those in cross-country dramas.