Sift together the flour, sugar, and the baking soda.
In a medium bowl add the crushed pineapple, eggs, and vanilla.
Add the dry sifted ingredients all together with the wet ingredients and mix well.
All the mixture to a 9x13 greased/floured pan.
Bake at 350 degrees for about 30-40 minutes.
Once the cake is done remove from the oven and begin the icing. Or if you would rather, you can begin the icing process about 5 minutes before the cake is complete.