Created by Fizzybrat on August 17, 2017
Step 1: Line a 20-cm (8-inch) square dish with plastic wrap and oil lightly.
Step 2: In a large bowl, sift the sugar and cornstarch together. Set aside.
Step 3: In a saucepan, sprinkle the gelatin on the strawberry purée. Let soften for 5 minutes.
Step 4: Add the sugar and bring to a boil.
Step 5: Remove from the heat and let cool for 5 minutes.
Step 6: Set a bowl in a saucepan partially filled with ice water; the water should come part way up the side of the bowl.
Step 7: Pour the strawberry mixture and corn syrup into the bowl.
Step 8: Beat with an electric mixer until the mixture has cooled to room temperature and forms stiff peaks, 5 to 7 minutes.
Step 9: Spread evenly in the dish and refrigerate until thoroughly chilled, about 3 hours.
Step 10: Line a cookie sheet with parchment paper.
Step 11: Lightly dust a clean surface with the icing sugar mixture.
Step 12: Unmould the marshmallow.
Step 13: Using a knife with a lightly moistened blade, cut the marshmallow into 4-cm (1 1/2-inch) squares. Roll each square in the icing sugar mixture in the bowl. Shake off any excess. Place the marshmallows on the cookie sheet and let warm to room temperature. If necessary, roll a second time in the icing sugar mixture.
Step 14: The marshmallows can be stored for several days at room temperature.