Hi David.
Keeping the meatballs cold before cooking helps preserve the fat, which is essential for the burger to have good juiciness and flavor. However, this becomes a bit more complicated when cooking thicker burgers.
Cooking a cold burger can result in a well-cooked exterior while the interior remains cold, which can affect the texture and cooking time. Therefore, for thicker burgers, it’s advisable to let them rest at room temperature for about 20-30 minutes before cooking. This helps them cook more evenly.
On the other hand, cooking the 150 g burger straight from the refrigerator in a hot cast iron pan can work, but make sure to adjust the cooking time. The dent on top can help it cook more evenly, but it’s still crucial that the internal temperature reaches at least 70°C (160°F) to ensure it’s fully cooked.
As a recommendation, before making a significant investment in meat, you can test with a slightly cheaper burger to see how it goes. You might try leaving one at room temperature and another straight from the refrigerator and compare the results.
In summary, while keeping the burgers cold helps preserve the fat, for thicker burgers, it’s better to allow them to reach a slightly higher temperature before cooking. This will ensure more even cooking and better texture.
I hope this information is helpful to you.
Best regards.