Cluster tomatoes are vine-ripened, then harvested still attached to their stems in groupings of 5 or 6 tomatoes called clusters. These tomatoes are prized for their uniform shape, size and rich red color. Their flavor is mildly sweet and they are excellent for slicing raw into salads. Select tomatoes that feel heavy for their size with no bruises or over ripe softness. The vine should display a bright green color. Like other tomatoes, these should not be refrigerated as it diminishes their flavor and turns the interior mealy.