Preheat the oven to 160°C fan (180°C conventional / 350°F / gas mark 4) and line two 18cm (7") sandwich cake tins (**see note for tips).
Melt the coconut oil and then leave it to cool to room temperature. Take the milk out of the fridge and bring it to room temperature.
150 g coconut oil, 320 ml dairy free milk
In a large bowl, sift in your flour and baking powder.
400 g self raising flour, 1 tsp baking powder
Add the sugar and mix the dry ingredients together.
220 g caster sugar
Add the room temperature oil, milk, lemon extract, vanilla and lemon zest (if you're using it).
1 tbsp lemon extract, 1 tsp vanilla, zest of 1 lemon
Mix with a large whisk until combined. Don't over-mix, just whisk for a few seconds until smooth and no pockets of dry flour remain.
Transfer the mixture to the two sandwich tins in roughly equal amounts.
Bake for 40 minutes until a skewer (or sharp knife) inserted into the centre of the cake comes out clean.Note: You want the skewer to be clean when it is removed from the cake, i.e. no wet batter on it. If the skewer comes out with a couple of dry crumbs on it (or clean), this is fine and the cakes should be ready to come out of the oven. Test both cakes in a couple of spots to be sure. Cool your cakes completely in the tins (for at least 2 hours).