Preheat the oven to 180C/356F and line a round cake tin with parchment paper.
To infuse the milk with tea and lavender, heat the milk on the stove or in the microwave until it's about to simmer. Remove it from the heat and add the tea bags and dried lavender. Stir briefly and let them steep for 3-5 minutes.
Remove the teabags from the milk and set them aside for later. Strain the milk to remove the dried lavender. Set it aside to cool down.
Mix 3 tbsp of the infused milk with the honey while it's hot. Stir until the honey is fully dissolved. Set aside for later.
Add the sugar to the softened butter. While stirring, add the eggs one at a time. You're after a homogenous mixture.
Add the flour, salt, and baking powder to the wet ingredients and slowly pour in the milk. Make sure the milk is lukewarm and not too hot or it will curdle the eggs. Combine everything thoroughly.
Add the zest of 1 lemon and the insides of one of the teabags to the batter. Fold them in slowly.
Add the cake batter to the lined baking tin and bake it for 45 minutes. To check if the cake is baked, insert a knife blade into the center of it. If the knife comes out clean, the cake is done. If it gets too dark during baking, cover it with an extra sheet of parchment paper.
Remove the cake from the oven and let it cool down in the tin for 10 minutes. Take it out of the tin and let it fully cool down on a cookie wire.
Make the icing
Combine the icing sugar, softened butter, and honey-sweetened, infused milk until a smooth icing has formed. Add more plain milk if the consistency is too thick.
Spread it generously over the cold cake. Garnish with dried lavender. Enjoy!
Notes
The infused milk has to be lukewarm before adding it to the cake batter. Also, make sure the cake has fully cooled down before you add the icing. Scroll up to the cream-colored box in the post for some additional tips on how to make this cake.