A slice twice as thick will require significantly longer cooking time to reach the same internal temperature as thinner slices, potentially leading to uneven cooking where the outside is overcooked while the inside remains undercooked. This difference is due to the increased mass and volume that needs to be heated.
When cooking, heat transfers from the outside of the food inwards. A thicker slice presents a greater distance for the heat to travel to reach the center. This means the outer layers of the thicker slice will be exposed to heat for a longer duration compared to the thinner slices.Consider a steak: a thin steak might cook through in a few minutes per side, achieving a medium-rare doneness. However, a steak twice as thick will require considerably more time. If you cook it for the same duration as the thinner steak, the outside will likely be well-done or even burnt, while the inside remains rare or even raw.The same principle applies to vegetables, meats, or any food item. The thicker the slice, the longer it takes for the heat to penetrate and cook the entire piece evenly. This difference in cooking time can lead to textural and flavor inconsistencies across the batch. To compensate, you might need to lower the cooking temperature and increase the cooking time for the thicker slice, or consider using a different cooking method altogether, such as searing followed by baking.
To ensure even cooking, try to slice ingredients to a uniform thickness whenever possible. If you have a thicker slice, consider pounding it to a more even thickness before cooking, or cook it separately and add it back to the dish later.