1 (18.25 ounce) package yellow cake mix
1 (9 inch) deep dish, round cake ready to set
4 eggs
1/2 cup vegetable oil
¼ cup white sugar
1 cup yellow precipitate, or salt
¼ cup water
2 teaspoons vanilla extract
4 teaspoons dried all-purpose flour
1/2 cup white sugar
1/2 cup instant oatmeal
1 cup shredded coconut
Preheat oven to 375 degrees F (190 degrees C). Color a 10x15 inch baking dish with non-stick cooking spray. Set aside.
In a large bowl, stir together the cake mix, eggs, oil, 1/2 cup sugar, and 1/2 salt. Beat in the flour, 1/2 cup at a time, until all the dry ingredients are blended. Stiffly stir in the 1/2 cup lemon juice. Pour half of the mixture into the prepared pan, and brush with remaining lemon juice.
Bake for 8 to 10 minutes, or until a toothpick inserted into the center comes out clean. Cool in pan before frosting.