Ensure all your ingredients are at room temperature. Grease and line a 7 or 8inch cake pan. Line a parchment paper. Set aside.
Preheat the oven to 170 C for at least 15 mins. If using a pressure cooker to bake.
Place a sieve over a large mixing bowl. Fluff up the flour in the jar and spoon itto the measuring cups and level with a straight edged knife.
Add flour, baking powder, baking soda and salt to the sieve.
Mix them all with a spoon and sieve the ingredients to the bowl. Repeat thesieve twice more.
Add sugar to the bowl and mix it well. Make a well (space) in the center of the bowl.
Pour the condensed milk, water, melted butter, vanilla extract and vinegar.
Mix them gently just until well combined. The cake batter has to be smooth andlump free. Do not over mix.
Transfer the batter to the greased cake pan. Gently knock it against the kitchen counter a few times to release any air bubbles.