In a bowl put the eggs, sugar, vanilla, vinegar, oil, milk and whisk it well.
Add flour, cocoa powder, salt, baking soda, and baking powder.
Mix it all well and pour the mixture into a round pan. Bake it at 180°C for 30 minutes.
For the glaze: In a pot add sugar, cocoa powder, salt, cornstarch, milk, and vanilla.
Mix it well and place it on heat. Mix until it thickens and add butter. Let the butter melt while mixing it. Leave it to cool.
Cut the cake into two pieces.
One-half place on a plate and spread one-half of the glaze.
Place the other half of the cake and spread the rest of the glaze all over the cake. Serve.
