Eggplant

Eggplant: freshness and ripeness guide

Eggplant is harvested young and immature, while the flesh is still tender and the seeds undeveloped, and it does not ripen, sweeten, or improve after picking — the glossy fruit in the bin is as good as it will ever be, so choosing well is the whole job. The single most reliable sign of a fresh eggplant is the skin: look for a taut, mirror-bright sheen and a deep, even colour, because a dull, faded, or wrinkled surface marks fruit that is past its prime. Press gently with a thumb — fresh flesh springs back, while a dent that stays put means the eggplant is old and spongy inside. Choose fruit that is firm and feels heavy for its size, and check the green cap and stem (the calyx) at the top: it should be fresh and green, not dried, browned, or carrying any grey mould, since a tired cap is one of the first places age shows.

Every eggplant is ready to cook the moment it is bought, so having good eggplant later in the week is a matter of storage rather than ripening. Eggplant is one of the most cold-sensitive vegetables in the produce aisle: it keeps best cool but not cold, around 10 to 12 °C, and a standard refrigerator is colder than ideal, so use it within a few days and, if you do refrigerate, keep it brief, loosely bagged in the crisper, and away from apples, pears, and tomatoes, whose ethylene speeds its decline. In Edmonton the practical caution is the cold: because eggplant chills so easily, never leave it in a freezing vehicle, an unheated garage, or pressed against the back wall of the fridge, where exposure below about 10 °C brings on the pitting, surface bronzing, and softening of chilling injury within a day or two.

An eggplant is past its useful window when the skin turns dull, wrinkled, or shrivelled, the flesh goes soft or spongy, a pressed dent fails to spring back, or brown sunken patches appear on the surface; a dried, browned, or mouldy cap is the same signal from the other end. Cut one open and age shows inside as well — an over-mature eggplant has firm brown seeds and a pithy, spongy interior and tastes bitter, where a fresh one has pale, barely visible seeds and mild, creamy flesh. Bronzed or pitted patches on the skin point to cold damage rather than ordinary spoilage, and that fruit should be used promptly before it breaks down further.

Sources:

• UC Davis Postharvest Research and Extension Center — Eggplant: recommendations for maintaining postharvest quality (chilling injury below roughly 10 to 12 °C, with surface scald, pitting, and bronzing; firm, glossy selection; ethylene sensitivity). https://postharvest.ucdavis.edu/produce-facts-sheets/eggplant
• Clemson Cooperative Extension Home & Garden Information Center — Eggplant (choosing firm, glossy, heavy-for-size fruit that springs back, with a fresh green cap, and storing cool rather than cold). https://hgic.clemson.edu/factsheet/eggplant/
• University of Illinois Extension — Watch Your Garden Grow: Eggplant (selecting smooth, glossy, firm fruit, avoiding dull or soft eggplant, and short cool storage). https://web.extension.illinois.edu/veggies/eggplant.cfm