Eggplant, the purple queen of the Mediterranean

The eggplant (Solanum melongena L.) is one of the most representative vegetables of the Mediterranean area. A key ingredient in famous dishes of Italian cuisine – such as eggplant parmigiana and caponata – it also plays an important role in national fruit and vegetable production.

It belongs to the family of Solanaceae — the same as tomato, pepper and potato — and stands out for a remarkable biodiversity varietal diversity, with elongated, oval or round fruits and colors ranging from intense purple to black, from white to striped lilac.

Besides its gastronomic value, the eggplant has interesting nutritional characteristics and contains bioactive compounds of growing scientific interest.

From Asia to the Mediterranean, over two thousand years of history

The origin of the eggplant is generally placed inSouth and Southeast Asia, especially in the areas between India, Myanmar and China, where it was already cultivated over two thousand years ago. From here it spread to the Middle East along trade routes. The introduction into the Mediterranean is attributed to Arab populations between the 7th and 10th centuries AD.

In Europe, the cultivation first became established in the Iberian Peninsula and in Sicily, territories marked by intense exchanges with the Arab world.

For centuries the vegetable was regarded with suspicion. A popular paretymology linked it to the Latin bad unwholesome, from which the Italian name would derive; linguistic studies more likely connect it to Arabic eggplant, in turn from Persian and Sanskrit. Only between the 17th and 18th centuries did cultivation and consumption consolidate, especially in Southern Italy regions.

Botany and seasonality: a berry that loves the heat

The eggplant is a perennial herbaceous plant in tropical areas, but cultivated as annual at European latitudes. It has a taproot system, erect and branched stem, broad and often tomentose leaves, violet hermaphrodite flowers and fleshy fruits classified as berries.

The species requires high temperatures for proper development, with an optimum generally between 22 and 30 °C. In open field, the Italian harvest is concentrated from June to October, while greenhouse productions extend commercial availability for most of the year.

Terroir, agronomy and sustainability

The quality of the fruit strongly depends on the interaction between genetics, soil and climate. Southern areas are particularly suited due to high solar radiation, favorable summer temperatures, well-drained soils, and availability of irrigation resources.

Cultivation requires careful management ofWater: excessive water stress compromises yield and organoleptic quality. Among the most common practices isgrafting onto tolerant rootstocks, useful to contain soil pathogens and improve resilience and productivity.

The strategies sustainable include crop rotations, organic fertilization, biological control, high-efficiency drip irrigation, and maintaining soil fertility through organic matter addition. Theorganic farming is particularly useful to reduce the use of synthetic pesticides and protect biodiversity.

The Italian supply chain in numbers

With 13.9 million tons of vegetables freshly harvested in 2024, Italy is the second largest European vegetable producer after Spain (14.8), while France follows at a long distance (5.8) (Eurostat, 2025).

For eggplant alone, Italy is at the same time:

• the first producer in the European Unionwith an estimated volume around 310,000 tons in 2024, ahead of Spain and Romania;
• the largest European consumer, with an apparent consumption (production + import − export) close to 339,000 tons.

The areas show stability in the long term, with fluctuations related to market and climate: in 2024 the eggplant harvested area in Italy – concentrated in Sicily, Campania, Apulia and Calabria – was about 10,030 hectares (Eurostat, 2025).

Red Eggplant of Rotonda PDO: the ‘pummadora’ of Pollino

The designation Red Eggplant of Rotonda PDO protects the local ecotype belonging to the species Solanum aethiopicum, cultivated in Basilicata in the municipalities of Rotonda, Viggianello, Castelluccio Superiore and Castelluccio Inferiore (province of Potenza), in the heart of Pollino National Park.

Introduced at the beginning of the twentieth century by veterans of African colonial campaigns, it is called in dialect merlingiana a pummadora for shape and color similar to a tomato.

The fruit has small size (up to 8 cm, weight within 200 g) and a color that at ripening turns from orange to shiny red. Its distinctive characteristic is the low content of chlorogenic acid, responsible for browning: for this reason the flesh does not blacken after cutting (PDO production specifications).

Nutritional profile: lots of water, few calories, many polyphenols

The eggplant is characterized by a high content of Water and low energy density. According to the CREA food composition tables, 100 g of edible portion provide about: 92% water, 23 kcal, 1 g protein, 0.4 g fat, 2.6 g carbohydrates, of which 2.6 g sugars, 2.6 g of dietary fiber (CREA, 2019).

I phenolic compounds are concentrated especially in the skin. Among these stand out thechlorogenic acid (which alone can represent up to about 90% of the phenolic acids in the pulp), the nasunin and the anthocyanins responsible for the purple coloration (Gürbüz et al., 2018).

Cooking the eggplant is useful to reduce glycoalkaloids (solasonine, solamargine) present in the raw fruit. The cooking method also affects the availability of polyphenols: frying increases the content of hydroxycinnamic acids, while baking and grilling favor the release of bioaccessible caffeoylquinic acids after digestion (Martini et al., 2021).

Polyphenols, metabolism and oxidative stress

The available scientific evidence suggests biological properties of eggplant that deserve to be further investigated, through additional clinical studies on humans to confirm health benefits.

Thechlorogenic acid shows a marked ability to neutralize reactive oxygen species and to modulate inflammatory processes (Gürbüz et al., 2018). The nasunin — an anthocyanin of the skin (delphinidin-3-coumaroylrutinoside-5-glucoside) — has shown antioxidant activity in experimental studies antioxidant, protection of cell membranes from oxidative damage and antiangiogenic properties (Alighadri et al., 2024).

Several studies also suggest favorable effects on lipid and glycemic profile: chlorogenic acid has been associated with inhibition of α-glucosidase, slowing intestinal glucose absorption, and antihypertensive and antidyslipidemic action, with possible implications for metabolic syndrome (Yarmohammadi et al., 2021).

Polyphenolic extracts from the skin of Italian cultivars have shown marked activity antioxidant also in cell models (Di Sotto et al., 2018).

In the kitchen: from parmigiana to caponata

Eggplant is the vegetable that more than any other knows how to transform when cooked: the spongy pulp absorbs fats, aromas, and seasonings with extraordinary effectiveness, delivering textures and deep flavors that the raw fruit — bitter, indigestible and rich in glycoalkaloids — would not suggest. This versatility explains the variety of preparations featuring it: from Sicilian caponata (sweet and sour, with celery, olives and capers) to grilled eggplants, stuffed, preserved in oil or worked into creams and vegetable pâtés.

The dish that best summarizes its character is the eggplant parmigiana: fried slices – or grilled, in the modern, lighter version – layered with tomato sauce, mozzarella, Parmigiano Reggiano PDO grated and basil, baked until forming a golden crust. Simple in structure, complex in flavor, this recipe is cited for the first time by a Neapolitan author, Ippolito Cavalcanti, in his treatise on Theoretical-practical cuisine (1837).

In the industrial transformation ready and semi-finished products, frozen and canned find space. The single-portion version of parmigiana is today among the most frequently rotated references in the segment of ready meals of vegetable origin.

Buying guide

Consumers are advised to prefer products organic certified, fruits firm and consistent, shiny and intact skin, green and fresh calyx, without bruises or browned areas. Overripe eggplants tend to develop larger seeds and notes bitter. When possible, it is better to prefer products of season and local origin, generally better in terms of organoleptic characteristics and with a lower environmental footprint.

Conclusions

The eggplant combines gastronomic history, economic value and nutritional interest. Introduced to the Mediterranean through centuries of cultural exchanges, it has become an identity element of Italian cuisine. The low calorie content and the presence of bioactive compounds make it fully consistent with the principles of Mediterranean diet, while the growing attention towards organic, varietal biodiversity and sustainability opens new prospects for enhancing the supply chain.

Dario Dongo

Credit cover Dario Dongo

References

• Alighadri, T., Tabibiazar, M., Mohammadi, M., Jahanban-Esfahlan, A., & Amarowicz, R. (2024). Nasunin, an amazing chemical constituent in eggplants (Solanum melongena L.): A review of its major properties and health-promoting effects. ACS Food Science & Technology, 4(1), 16–35. https://doi.org/10.1021/acsfoodscitech.3c00582
• Cavalcanti, I. (1837). Theoretical-practical cuisine. Printing house of G. Palma. See Chapter XIII, page 118. Milinsane farsite alla Parmeggiana. Digitized edition available on Internet Archive: https://archive.org/details/IppolitoCavalcanti-CucinaTeorica-pratica
• Consortium for the protection of the PDO 'Red Eggplant of Rotonda'. https://www.melanzanarossadirotondadop.it
• CREA – Council for Agricultural Research and Economics. Food composition tables: Eggplants, raw. https://www.alimentinutrizione.it/tabelle-nutrizionali/005500
• Di Sotto, A., Di Giacomo, S., Amatore, D., Locatelli, M., Vitalone, A., Toniolo, C., Rotino, G. L., Lo Scalzo, R., Palamara, A. T., Marcocci, M. E., & Nencioni, L. (2018). A polyphenol rich extract from Solanum melongena L. DR2 peel exhibits antioxidant properties and anti-herpes simplex virus type 1 activity in vitro. Molecules, 23(8), 2066. https://doi.org/10.3390/molecules23082066
• Eurostat. (2025). How much fruit and vegetables does the EU harvest? https://ec.europa.eu/eurostat/web/products-eurostat-news/w/ddn-20250825-1
• Gürbüz, N., Uluişik, S., Frary, A., Frary, A., & Doğanlar, S. (2018). Health benefits and bioactive compounds of eggplant. Food Chemistry, 268, 602–610. https://doi.org/10.1016/j.foodchem.2018.06.093
• Martini, S., Conte, A., Cattivelli, A., & Tagliazucchi, D. (2021). Domestic cooking methods affect the stability and bioaccessibility of dark purple eggplant (Solanum melongena) phenolic compounds. Food Chemistry, 341, 128298. https://doi.org/10.1016/j.foodchem.2020.128298
• Yarmohammadi, F., Ghasemzadeh Rahbardar, M., & Hosseinzadeh, H. (2021). Effect of eggplant (Solanum melongena) sul sindrome metabolica: una revisione. Iranian Journal of Basic Medical Sciences, 24(4). https://doi.org/10.22038/ijbms.2021.50276.11452