Vanilla Bean Bundt Cake

3 cups flour 
1 tsp baking powder 
1/2 tsp baking soda 
1/2 tsp salt 
1 1/4 cups softened butter 
1 3/4 cups sugar 
2 vanilla beans 
4 eggs 
1/4 tsp pure lemon extract 
1 cup buttermilk

1. Preheat oven to 350F. Grease and flour a bundt pan. 
2. In a medium bowl, whisk together flour, baking powder, baking soda and salt. 
3. In a large bowl, beat together the butter and sugar until fluffy. Halve the vanilla beans lengthwise, and scrape out the seeds with the tip of knife. Mix into butter mixture. 
4. Add eggs, one at a time, beating well after each addition. Beat in lemon extract. 
5. Alternate folding in the flour mixture and buttermilk, making three additions of flour and two of buttermilk. 
6. Pour into bundt pan and smooth out. Bake for approximately one hour, or until an inserted knife comes out clean. Let cake rest in pan for one hour, then turn out onto a cooling rack and let sit for another hour before glazing.