Chef'n SpiceCube Herb Freezer Tray Freeze and preserve fresh herbs to use later with this herb keeper. Fill each tray with fresh herbs, taking care not to overfill. Place the lid on top of the container and press each individual cup down to seal and store in the freezer. Each cup opens independently to add a cube of fresh frozen herbs to soups, sauces, and more year round. This container is top-rack dishwasher safe.