What do the numbers on the tray (e.g., 55, 50, 45) indicate?

The numbers on the tray, such as 55, 50, and 45, indicate the temperature required for proofing the dough. Proofing is a critical step in the dough preparation process, allowing the yeast to ferment and the dough to rise properly. Each number represents an optimal temperature setting that helps achieve the desired texture and flavor in the finished product.

In this context, knowing the proofing temperature is essential for ensuring that the dough has enough time to develop without risking under or over-proofing, which can affect the overall quality of the pizza. Proper management of proofing temperatures contributes significantly to consistent results in pizza quality across different batches.

Other options do not accurately represent what the numbers indicate; for instance, the amount of dough or size of the tray wouldn't be measured in temperature values, and while there is a required baking time, that would typically be given in minutes rather than numerical values like those presented.