Preheat the oven to 325 degrees Fahrenheit.
Grease and flour two 8" round (2-inch deep) cake pans very well.
In a medium-sized bowl, add the oil, vanilla, buttermilk, lemon zest, lemon extract and 1-2 drops concentrated gel yellow food coloring and whisk well. Set aside.
In another medium-sized bowl, add the flour, salt, baking powder and baking soda and whisk well. Set aside.
In a large mixing bowl, add the butter and sugar, then mix on medium-high to high for about 4 minutes until light and fluffy.
Add the eggs one at a time, mixing on medium speed only for about 20 seconds after each egg is added.
Alternately add in the dry and liquid ingredients being careful only to mix until just combined after each addition.
(Start with ⅓ of the dry mixture, mix only on medium and just until combined. Add ½ the liquid mixture, mix until just combined, then another third of the dry mixture and mix only until combined. Add the last ½ of the liquid mixture, mix, then add the last third of the dry mixture and mix just until combined.)
Be careful not to mix too long or at a higher speed. Only mix until everything is well incorporated. Mixing too long will make the cake come out dense, rubbery or it may fall. If the batter needs more yellow food coloring, add in a bit more, but try not to mix the batter too long after adding it.
Pour the batter into the prepared pans and bake in a preheated oven at 325 degrees F for about 40-45 minutes on the middle rack. A toothpick inserted into the center of each layer should come with either a few moist crumbs on it or clean. Note that the cake layers will bake up with flat tops.
Remove the baked cake layers and let them cool on wire racks, still inside the pans for about 15 minutes, then remove the cake layers from the pans and let them cool completely on the racks before adding the frosting. Be careful removing the cake layers from the pans as these cake layers are very delicate and tender.