Caramelizing meat
This method is a bit special to explain. It only applies to small foods: steaks, ribs, pork chops, etc... I called it caramelized but it's not quite that. The principle is to sear the meat at high temperature to get a crispy surface. However, when you use a sweet marinade, this will lead to caramelization of the surface, you can use this technique with pork, chicken, turkey, etc... To achieve this result, you need a very high temperature from the start of cooking.
Caramelization is also known as the Maillard reaction, caramelization occurs when you heat sugar and amino acids. This reaction occurs between 148 and 260°C.
burnt meat
The meat is considered burnt when its surface becomes brittle and completely black. Burnt meat is dangerous, firstly because the burnt taste is very unpleasant, and secondly because it's dangerous for your health. The meat blackens when it comes into contact with a metal grill that's too hot (above 260°C). Therefore, you shouldn't set up the grill too far in advance.
How to achieve beautiful grill marks
As you've understood, to achieve beautiful grill marks on your steak, you need to preheat the grill beforehand. Above 260°C, however, at this temperature, you shouldn't leave the meat on the grill for more than 1 minute, or it will be burnt. The goal is to get a piece of meat that's well-grilled on the surface and juicy in the center. Don't be afraid, most people seeking this result flip the meat too quickly, you should wait between 45 seconds and one minute (or more if the grill wasn't hot enough), you should get a brown color, not golden. Just be careful not to overcook the meat, which would make it dry.
To get beautiful marks, the work begins even before lighting the fire. The first thing is to have a very clean grill with no trace of fat. This way, the contact between the metal and the meat will be optimal. The second thing to do is to coat the cooking grate with a little sunflower oil. Don't use olive oil, which starts to burn at a lower temperature, which will give your meat a bad taste.
For the meat, make sure the grill is completely dry. Of course, for marinades there's no problem, but the meat needs to be well-soaked. Take your meat out of the fridge before cooking it, because a few drops of water are enough for the meat to detach from the grill and the result won't be as successful.