Delicious grapes

I like to eat a lot of fruits, such as: cold and refreshing watermelon, sweet and sour plum, and juicy sweet lychee, but the most pleasing to my heart is the crystal clear purple grapes.

I remember last Saturday, I was stumped by a math problem. At this moment, my mother brought me a plate of purple agate-like grapes. These grapes are crystal clear, full of grain, and look very delicious. A grape gently peeled off its purple and sturdy skin. Just biting it down, it was full of fruit, which made me feel good afterwards. Later it became sour, and then slowly turned into a sweet taste. "Ah! It's delicious!" I called involuntarily.