Raw garlic can have a bitter flavor. Especially if you have the bulb for awhile. This can be an issue when you serve a dish that needs a delicate dose of raw garlic, like hummus or herbed olive oil for dipping.
I read recently that the bitter taste can be prevented by simply taking the green shoot out of the center of the garlic clove before chopping.
To remove the shoot, simply peel the clove and slice it length-wise. Locate and remove the light green shoot from each side of the sliced clove and prepare your dish.