1Preheat oven to 350 degrees F (175 degrees C). Grease and flour a 9x13 inch pan. Sift together the flour and baking soda; set aside.
2In a large bowl, combine eggs, 1 cup white sugar and pineapple with juice. Beat in the flour mixture. Pour into prepared pan. sprinkle brown sugar over top of batter.
3Bake in the preheated oven for 40 to 45 minutes, or until a toothpick inserted into the center of the cake comes out clean. Remove from oven and prick top with a fork. Pour on topping while still hot.
4To make the topping: To Make Topping: In a small saucepan combine the butter, evaporated milk, 1 cup white sugar, and 1 teaspoon vanilla. Cook over medium low heat, stirring occasionally until sugar is dissolved. Mixture will be thin. Pour over hot cake.