Prepare Custard (optional):

1. Heat milk, vanilla, and salt over medium heat until warm.

2. Whisk cornstarch, sugar, and egg yolks until smooth.

3. Slowly temper eggs by adding warm milk while whisking.

4. Return to saucepan; cook, stirring constantly until thickened (3-5 minutes).

5. Stir in butter, chill covered until cold.

Make Whipped Creme:

1. Beat heavy cream, powdered sugar, and vanilla in chilled bowl until stiff peaks form.

Assemble Sandwiches:

1. Spread whipped cream (and custard if using) on bread slices.

2. Add halved strawberries, top with another slice, gently press.

Fry Sandwiches:

1. Heat vegetable oil about ¼ inch deep over medium heat.

2. Fry sandwiches 1-2 minutes per side until golden.

3. Drain and dust with sugar.