Trimming broccoli stems at a diagonal increases the surface area exposed to heat, allowing them to cook more evenly and quickly compared to a straight cut. This helps ensure the stems are tender and not tough when roasted or stir-fried.
When roasting or stir-frying broccoli, the goal is to achieve a consistent texture throughout the florets and stems. Broccoli stems are denser than the florets and therefore take longer to cook. Cutting the stems at a diagonal serves a few key purposes:
Increased Surface Area: A diagonal cut significantly increases the surface area of the stem that is exposed to the heat of the pan or oven. This allows for more efficient heat transfer, leading to faster and more even cooking.
Improved Texture: By cooking the stems more evenly, you avoid the common problem of having perfectly cooked florets while the stems remain tough and undercooked. The diagonal cut helps the stems become tender and palatable.
Enhanced Flavor Absorption: The increased surface area also allows the stems to absorb more of the flavors from your seasonings, sauces, or oils, resulting in a more flavorful dish.
In essence, the diagonal cut is a simple technique that addresses the difference in cooking time between the florets and stems, leading to a better overall result.
Peel the outer layer of the broccoli stem before cutting it diagonally. This removes the tough, fibrous exterior and further improves the texture of the cooked stem, making it more tender and enjoyable to eat.