In a medium saucepan, whisk together the sugar and cornstarch.
Gradually add the water and cook over medium heat, stirring constantly, until the mixture thickens and becomes clear (about 5-7 minutes).
Remove from heat and stir in the strawberry gelatin until dissolved.
Let the mixture cool for 10–15 minutes so it doesn’t wilt the strawberries.
Place the strawberries into the baked pie crust, then pour the gelatin mixture evenly over the top.
Chill in the fridge for at least 4 hours, or until fully set.
Serve with whipped cream if you're feeling fancy—or just grab a fork.