Freeze them! Wash the strawberries and hull them. Place a baking paper on a baking tray and place the strawberries on top (as even as possible). Put the baking tray in the freezer. Let them freeze for at least four hours. Then remove the strawberries from the baking tray and put them in a freezer bag. TIP: Frozen strawberries are ideal for a frozen strawberry smoothie with orange.