Why Does Eggplant Absorb So Much Oil When Fried?

The reason eggplant absorbs so much oil when fried is its porous, sponge-like cellular structure. Raw eggplant consists of a loose network of tissue with small air-filled gaps between cells; these gaps collapse with heat and are largely filled by oil. In short, unlike other vegetables, eggplant does not absorb oil so much as hold oil in the spaces that had been filled with air. The thicker and more porous the slice, the more oil it absorbs. Why is eggplant's cellular structure so absorbent? The fleshy part of eggplant consists of loosely connected cells and air pockets between them. The cell walls on the surface that touches hot oil quickly soften and collapse, shrinking the tissue's volume. The emptied air pockets immediately fill with surrounding oil; eggplant acts almost like a sponge as it cooks. The skin has a tighter structure, so eggplant fried with its skin on absorbs a little less oil than the seeded interior. Does salting really work? Salting sliced eggplant and letting it rest for 20-30 minutes draws water out of the cells by osmosis. During this time, the cell walls shrink somewhat and the pore volume decreases, so the amount of oil absorbed during frying also decreases. The eggplant's slightly bitter taste is reduced along with the drained liquid; after resting, thoroughly patting the slices dry with a paper towel also prevents oil from mixing with water and splattering. How does oil temperature affect absorption? An eggplant slice placed in oil that is not hot enough absorbs more oil than usual because it stays in the oil longer before its surface firms up. When the oil reaches around 170-180°C / 340-355°F, the surface quickly forms a crust, limiting the amount of oil that enters. For this reason, place the slices in the oil one at a time, in small batches that will not lower the oil temperature; an overcrowded pot quickly lowers the oil temperature and increases absorption. Practical ways to fry with less oil Leaving the slices 1-1.5 centimeters thick instead of cutting them thin balances the surface-to-volume ratio and reduces total oil absorption. Partially precooking the slices in the oven or on a grill for a few minutes before frying also partially closes the pores. Letting the slices rest on a paper towel for a few minutes after frying helps drain excess surface oil. How does cooking in an oven or air fryer change oil absorption? Brushing only a thin layer of oil on the surfaces of eggplant slices and cooking them in an oven or air fryer uses much less oil than pan-frying. Hot air circulation does not create an environment that surrounds the eggplant with oil on all sides as in a pan; for this reason, the amount of oil available to absorb is limited from the start. The resulting texture is a little drier and less soft than pan-fried eggplant because the layer of oil on the surface remains thin and does not give the interior the same sheen. Still, for someone who likes a rich flavor, frying in a pan with a small amount of oil over medium heat can be a compromise that preserves the texture. Grilling or cooking over charcoal is another way to soften eggplant using almost no oil; instead of oil absorption, a smoky aroma comes to the fore, and the interior cooks in its own juices. For someone seeking a less oily result, grilling can be considered the alternative furthest from frying.