Preheat the oven to 350 degrees F. Add parchment paper to a loaf pan.
Zest a lemon. Microwave the milk so that it is warm to the touch. Sprinkle in lavender and lemon zest to infuse.
In a medium bowl, sift together flour, salt, baking powder, sugar and poppy seeds.
Juice lemons until you get about ⅓ cup lemon.
In another bowl, combine sour cream, butter, lemon juice, infused milk mixture and eggs. Whisk everything together.
Pour the wet ingredients into the dry. Mix until combined.
Pour the batter into the prepared baking loaf pan.
Bake for about 60- 90 minutes or until the center is set and the edges are slightly pulling away.