Preheat the oven to 350 degrees F (175 degrees C). Grease a 9x5 inch loaf pan. (I actually used a 8x4 bread pan successfully, so you could use either or.)
In a medium bowl, whisk together the freshly milled flour, baking powder, and salt.
In a separate large bowl, cream together the butter and sugar until light and fluffy.
Then, add the eggs one at a time, mixing well after each addition.
In a small bowl, add milk and vinegar, then stir in the vanilla extract.
Alternately add the wet and dry ingredients to the butter, sugar, egg mixture. Start and end with the flour mixture. Also, make sure to stir/mix slowly to combine after each addition.
Pour the batter into the prepared loaf pan and smooth the top with a spatula.
Bake for 45-55 minutes or until a toothpick inserted in the center comes out clean of batter (it can be a bit moist, that is fine.)
After baking, remove the cake from the oven, then loosen the edges to make sure nothing sticks.
Let the pound cake cool in the pan for 5- 10 minutes before transferring it to a wire rack to cool completely.
You can sift powdered sugar on top, or slice and serve with fresh berries and whipped cream, or eat it plain.
To Store: wrap in plastic wrap to lock in the moisture and let the flavors marry. Often times pound cake flavor is better the next day!