Mix the flour, salt and baking soda and sieve this together to ensure even mixing. Set aside.
Preheat the oven to 180 degrees C.
Grease an 8″ round cake pan with oil and set aside.
Combine the sugar, oil, water, lemon juice and vanilla in a mixing bowl and whisk until the sugar completely dissolves.
Add the tutti frutti and mix.
Add the flour in 2 batches and gently fold the mixture until the batter shows no trace of flour. Don’t overmix or overbeat.
Quickly pour this batter into the greased cake pan.
Immediately place the pan in the preheated oven. Bake at 180 degrees C for 35 minutes or till a toothpick inserted into the middle of the cake and comes out clean.
Allow the cake to cool down for 15 minutes and then invert.