Preheat your oven to 160 degrees Celsius (356 degree Fahrenheit)
Add the vinegar to the almond milk (you can also use soy milk) to make your butter milk and set aside
Cream butter and sugar together and whisk until light and fluffy.
Add butter milk and vanilla and give the mixture a quick stir.
Sift in the flour, bicarbonate and salt and mix until combined, but do not over whisk as it will build up the gluten in the flour and take away the lovely crumbly texture of the sponge.
Grease the three tins with dairy free spread or oil then line with a piece of balking paper on the base.
Divide your cake mixture equally between the three pans (about 500g per mixture)
Bake for 30-35 minutes until golden brown and a wooden skewer comes out clear.
Let the cakes cool in the pan fully before assembling your cake.