aubergine berry brinjal cultivars eggplant elongated elongated-oval-shaped food fruit glossy guinea squash healthy melongene nightshades nutritional oval-shaped perishable shapes smooth Solanaceae Solanum melongena spongy texture taste texture textures variations variety vegetable vegetarian white appearance appearances color colour droplets drops guinea-squash moist moisture purple Solanum-melongena spongy-texture sprayed surface surfaces wet elongated oval-shaped