Combine 450 ml of milk, 110 grams of sugar, and 50 grams of ground black pepper in a saucepan. Heat on low for 10 minutes. Let the mixture cool slightly, then pour it into a bowl. Fruit flies are irresistibly drawn to this concoction, and they will drown in it.
Red Wine
Fruit flies are attracted not only to vinegar but also to the scent of red wine. Leave a small amount of red wine in a bottle. Soon, it will be filled with fruit flies. The narrow opening allows them to enter but makes it difficult for them to escape.
Wait until you read the ending — then discover another story you won't believe.