Step 1

Grease and flour an 8X8 square baking dish. Set aside.

Step 2

Preheat your oven to 325 degrees F.

Step 3

Begin to beat egg whites and add vinegar. Beat until stiff.

Step 4

In a separate bowl, beat the egg yolks and sugar together.

Step 5

Add the water, salt, and vanilla extract as you continue to mix everything together.

Step 6

Add the melted butter and continue to beat everything together.

Step 7

Slowly add the flower and mix it in.

Step 8

Add the warm milk and beat until it is well incorporated.

Step 9

Fold in the beatened egg whites using a spatula or a spoon to mix it in gently.Tip: Be sure not to overmix this part, you still want to see some of the egg white floating on top of the batter.

Step 10

Pour your batter into your already greased and floured baking dish.

Step 11

Bake your cake for about 60 minutes or until the top is golden and cake is still soft.Let your cake cool in the pan for at least 3 hours before serving with powder sugar sprinkled over top.