Chef Andy Hearnden, popularly known as Andy Cooks on TikTok, emphasizes the importance of preheating the pan when cooking beef mince to avoid a grey and watery result. In a viral video with over 4.1 million views, he explains that the pan needs to be hot enough for the Maillard reaction to occur, which is crucial for browning meat. To check if the pan is ready, a splash of water should fizz and evaporate quickly. Andy recommends using a high smoke point oil and adding the mince gradually, seasoning it with salt, and allowing it to cook without stirring for a few minutes. This method not only enhances the color but also the flavor, creating a rich crust on the meat. Viewers have reacted positively, with many acknowledging the significance of proper pan preheating in achieving delicious meals.