Green tomato, known as Pacha Thakkali in Malayalam, is an unripe tomato with a firm texture and a distinctly tangy, slightly sour flavor. Commonly used in South Indian cooking, it adds a sharp, refreshing taste to curries, chutneys, thoran, and stir-fries. Pacha Thakkali is valued for its ability to enhance dishes with natural acidity and balance rich or spicy flavors.