Need two bowls. In Bowl One, Mix dry ingredients, flour, baking powder, baking soda and salt. In bowl Two (larger bowl) beat butter, granulated sugar, on high for 2 to 3 minutes until fluffy. Beat in eggs one at a time. Whisk in 1/4 cup lemon juice, the zest, thyme and vanilla. On low speed mix in half the flour mixture, then buttermilk, then last of flour mixture. Pour batter into greased bundt pan. Tap to release air in batter.