1. Peel the apples and slice them thinly.

2. Heat a pan over medium heat and melt the butter in it.

3. Add the apple slices and cook them for about 5 minutes until they become soft.

4. Meanwhile, prepare the vanilla sauce. Mix the all-purpose flour with some cold water to form a smooth paste.

5. Heat a pot over medium heat and add the vanilla sauce, all-purpose flour, sugar, and salt. Stir continuously until the sauce thickens.

6. Once the apples are soft, serve them on a plate and pour the warm vanilla sauce over them.