For Cake:

1. Pour the lemon cake mix into a bowl and add the water and vegetable oil. Then, with either a whisk attachment or spatular, mix until combined
2. Pour the mixture into a loaf tin or a 6″ round cake tin 
3. Bake at 180ºC, 360ºF, Gas 4, for approximately 40 – 50 minutes.

For Muffins: 

1. Pour the lemon cake mix into a bowl and add the water and vegetable oil. Then, with either a whisk attachment or spatular, mix until combined
2. Pour approximately 75g of the batter into paper cases
3. Bake at 180ºC, 360ºF, Gas 4, for approximately 20 – 30 minutes.