Make the pistachio paste: In a food processor, blend the pistachio, powdered sugar and 2 Tbsp of water. Continue adding 1 teaspoon of water at a time until the mixture becomes a thick, smooth paste.
Make browned butter: In a saucepan, melt the butter on medium heat and continually whisk until the butter turns dark.
Remove pan from heat and stir in the brown sugar and honey.
The madeleines: In a small bowl, whisk together the flour, baking powder, and salt.
In a medium bowl, whisk eggs and sugar until pale, light and fluffy, about 2 minutes.
Fold the flour mixture into egg mixture in 2 batches.
Add the pistachio paste, fold till barely streaking. Add the butter mixture, fold again until combined.
Cover the bowl and place it in the fridge for 30 min to cool.
Set the oven to 350℉. Butter the madeleine pan and place it in fridge until cold to touch.
Once batter and pan are chilled, spoon batter onto pan, about 3/4 full. Chill the batter in the pan in the fridge for another 10 minutes in case of warming.
Bake for 8 minutes. Remove from oven and let it cool for 5 minutes before unmolding with a toothpick or knife.
Chill the pan again and repeat for a second batch. Enjoy!
Notes
There's a couple different parts to this recipe, but the key is adding honey into the browned butter. You can skip browning the butter but that decreases the nutty flavor.
You can use 1/4 cup of pistachio paste instead of making it yourself.
Err on the side of under mixing to allow the eggs to still be fluffy in the batter.
Refrigerating the batter and pan is key to crispy cakes that are easy to unmold