Preheat oven to 350 degrees.
Warm your buttermilk (not boiling temperature, but hot) over the stove or in the microwave. Add 2 tea bags and let steep while you continue other steps. (*See note 2)
In a small bowl, massage sugar with lemon zest.
Add sugar and lemon zest to butter. Using stand or hand mixer, beat at high speed until light and fluffy. This will take at least 5 minutes, and color will become slightly lighter. Scrape bowl as needed.
While it is beating, mix dry ingredients together in large bowl - flour, baking powder, salt & poppy seeds.
Once butter is light and fluffy, add eggs, one at a time, waiting until mostly incorporated before adding the next. Then add vanilla extract, lemon juice, and lemon extract. Mix on medium speed until well combined.
On low speed, alternate adding flour and infused buttermilk. Discard tea bags. You should start and end with flour (1/3 flour, 1/2 buttermilk, 1/3 flour, 1/2 buttermilk, 1/3 flour). Mix until just combined.
Divide into greased pan(s).
Bake until lightly golden on top & toothpick comes out clean, about 35-40 minutes for mini loaves or 45-55 minutes for single large loaf.
Allow to cool inside pan for at least 10 minutes.