flavoring
A substance added to food or drink to change its taste.
A flavoring is a substance added to food or drink to give it a particular taste. When you add vanilla extract to cookie dough, sprinkle cinnamon on oatmeal, or squeeze lemon juice into water, you're using a flavoring to make something taste better or more interesting.
Flavorings can come from natural sources like fruits, herbs, and spices, or they can be created artificially in laboratories to mimic natural tastes. The strawberry taste in some candies might come from real strawberries, or it might come from chemicals designed to taste like strawberries. Both are flavorings, though they're made differently.
Some flavorings are obvious and strong, like the peppermint in candy canes. Others are subtle, working in the background to enhance other tastes. Professional bakers and chefs use flavorings carefully, knowing that a few drops of almond extract or a pinch of nutmeg can transform an ordinary dish into something memorable. The art lies in using just enough: too little and you won't taste it, too much and it overwhelms everything else.