In a medium saucepan, stir together sugar, cornstarch, and gelatin; add water. Cook stirring over medium heat until thick. Remove from heat and allow to cool completely. Gently fold in the strawberries.. Cook for 2 minutes, stirring constantly, until mixture thickens. Remove from heat and cool completely.
Next, in a large mixing bowl, beat the heavy cream and sugar until soft peaks form. Add the vanilla and whip until combined.
To assemble, place chunks of angel food cake on the bottom of a trifle dish or glass. Layer the whip cream over the cake. Top with strawberry sauce. Repeat the layers as needed.
Chill until ready to serve.
Notes
If you don't make your own whipped cream, then substitute your favorite store brand in.