Obviously I am suggesting that you have a day where you taste things, however I don't want you to go anywhere near anything that jeopardizes your health. And if you are a vegetarian, don't go eat meat. Actually don't do anything that makes you uncomfortable or will make you sick. The idea is to get an idea of what things taste like so if you are allergic to certain things or don't want to try it, just ask someone who likes those things and won't be hurt if they eat or have eaten them.
Start simple. You could go to a restaurant and order something new or one of your favorites and take notes about each thing you taste. Or try cooking something at home. Either way simply enjoy the food, feel the textures, concentrate on the spices, and how it makes you feel.
Expand. Taste things that aren't food, that are safe. Don't go eat a fist full of dirt or sand, and certainly don't do yourself or anyone else any harm. Be safe about it. If you're going to lick a window or a rock, make sure there are no rough edges. BE SAFE!
Apply what you learn or know to a character in someway. Does your character like TV dinners due to their simplicity because they have a busy life? Do they have any thoughts on if they taste good or if they are simply a means to get by because they don't have the time to go out for food? Are they just too lazy to cook? Do you have a character who only eats organic or maybe they will only eat meals prepared by a chef and don't cook? What if your character can cook and very well, what sorts of things do they like to cook? What if they don't eat food? What would you say a soul tastes like?