Red grapes can be eaten fresh, in salads, as a snack or as a dessert. Good-quality grapes are well colored, plump, and firmly attached to the stem. Select grapes that are fairly firm, but not rock-hard. Red varieties are best when red coloring predominates on all or most of the berries. Grapes do not ripen further once off the vine. Avoid grapes that are soft, wrinkled, shriveled or shattered.