Place whole strawberries into a colander, rinse under cold water, and gently pat dry with a kitchen towel in a single layer. Do not soak the berries in water or they’ll lose some flavor and nutrients. Remove the stems. Place the strawberries in a single layer on a serving plate lined with wax paper, not touching one another. Freeze for about half an hour, or until solid. Store frozen strawberries in plastic resealable bags or airtight containers. Keep them in the freezer for up to six months.