Next tilt your head back and taste the quinine. Notice how bitterness is registered on the back of your tongue. Finally, mix the sweet and sour solutions. When tasting wine, it's critical to hold it in your mouth long enough to taste all of the flavors. The first flavor to be detected is sweetness, or fruitiness.
Sweetness comes from natural grape sugars and alcohol.
This is called the wine's attack . The second flavor to be detected is sourness, or acidity. Acidity serves to amplify and develop the fruity flavors initially tasted in the attack. As these flavors develop, they become more pronounced and obvious. This is called the wine's evolution .