Poppy Seed Cake
["6 oz. (1 1/2 stick butter), softened to room temperature", "1 2/3 c. sugar", "3 eggs", "grated peel of 1 lemon", "2 Tbsp. fresh lemon juice", "1 1/2 tsp. vanilla", "2 2/3 c. sifted cake flour", "1 1/2 tsp. baking powder", "1/2 tsp. baking soda", "1/2 tsp. salt", "1 1/2 Tbsp. poppy seeds", "3/4 c. buttermilk"]
["Spread butter all around the bottom and sides of a 13 x 9-inch cake pan and set aside.", "Shake out any excess flour.", "Put 6 ounces of butter and the sugar into a medium-size bowl and cream until well blended and smooth.", "Scrape down sides with rubber spatula.", "Crack 1 egg at a time and drop directly into the batter. Beat well after each addition and continue to beat until batter is smooth.\tAdd lemon peel, lemon juice and vanilla and mix well."]
["butter", "sugar", "eggs", "lemon", "lemon juice", "vanilla", "cake flour", "baking powder", "baking soda", "salt", "poppy seeds", "buttermilk"]