Daisies and additional lemon verbena leaves, optional
Preheat oven to 350°. In a bowl, beat the egg yolks on high until thickened and lemon-colored. Add water, lemon verbena and vanilla. Gradually beat in 1 cup sugar. beat for 4-5 minutes or until mixture doubles in volume. Combine flour and baking powder; sprinkle 1/4 cupful over batter and fold in until combined. Repeat with remaining flour mixture; set aside.
In another bowl, beat the egg whites, cream of tartar and salt until soft peaks form. Add remaining sugar, 1 tablespoon at a time, beating until stiff peaks form. Gently fold into batter. Pour into an ungreased 10-in. tube pan. Bake until top springs back when lightly touched, 45-50 minutes. Immediately invert the pan; cool completely. Run a knife around sides of pan and remove cake to a serving plate.
In a bowl, cream 2 cups sugar, butter, lemon juice and extracts. Slowly add remaining sugar. If needed, beat in a small amount of water until the frosting reaches desired spreading consistency. Frost cake. Garnish with daisies and lemon verbena if desired.
Verify that flowers are edible and have not been treated with chemicals.