To really figure out if a tomato is a fruit or vegetable, you need to know what makes a fruit a fruit, and a vegetable a vegetable. The big question to ask is, DOES Missing: monk. Monk fruit is a traditional zero calorie sweetener whose extract rivals stevia in usefulness and Do your tomato plants grow huge and out of control each year? With sugar intake at an all-time high, finding healthier, sweet alternatives has been a priority for many people. Sugar substitutes and artificial sweeteners tend to.