Be sure to add some vinegar and cook it before eating. People will use green tomatoes to cook in daily life to improve the taste, but green tomatoes contain alkaloids, that is, solanine, which are needle-like crystals and are very stable to alkalinity, but can be hydrolyzed by acid. Therefore, immature green tomatoes will feel uncomfortable after eating, ranging from bitter taste in the mouth to dizziness, nausea, general malaise, vomiting and general fatigue, and even life-threatening in severe cases.