Firstly, mill the flour. I recommend using soft white wheat for this recipe.
Preheat oven to 450*F with your empty muffin pan inside (on top of a baking sheet to catch any spillage). I recommend a stainless steel muffin pan. A very hot pan is what makes this recipe work!
Combine eggs, milk, salt, and fresh milled flour into a blender, and then blend until smooth and frothy. (You can make this without a blender, and heavily whisk the batter in a bowl instead.)
Allow the batter to sit for about 5-10 minutes as the oven preheats.
Once the pan and oven are preheated, then add about 1/2 TBSP of butter into each of the 6 muffin wells, place the pan back in the preheated oven for the butter to melt.
Once the butter has melted, pour your batter evenly into each buttered well. Fill each one up about 3/4 of the way, not full, they will puff up! You may not use all of your batter, it depends on the size of your eggs.
Bake the FMF Popovers at 450*F for 18-20 minutes, then without opening the oven, reduce the heat to 350*F, and bake for 10 more minutes. (It is important to leave the oven closed during baking.)
Once done and browned on top, remove them from the oven and serve. They will deflate pretty quickly as they cool.