Melt the butter and combine with brown sugar, white sugar and egg yolks mixing well with mixer. Add flour, baking powder, salt, vanilla extract and lemon extract and continue beating. Beat egg whites in a separate bowl until stiff and fold into batter with a spoon mixing well. Fold in nuts.
Generously spray bundt pan and pour in batter. (You can make this cake in a 9 x 13 pan, too.) Bake in preheated 350 degree oven for 40 to 45 minutes until center tests done. Sprinkle with powdered sugar or drizzle on lemon glaze recipe below.
Lemon Glaze Instructions
Beat with whisk or spoon until you get the right consistency to pour over cake. Can add more milk if needed. (Can heat a few seconds in microwave. This makes it easier to pour. I use a small pitcher and drizzle over cake.)
Notes
The batter will be very thick before you add the egg whites. Just keep working them in, until you can pour it into the pan.