The Best Yorkshire Pudding
1 cup all-purpose flour
1 cup milk  
3 large eggs  
Kosher salt  
1/4 cup rendered beef fat (see Cook's Note)  
Instructions:
Preheat the oven to 400 degrees F.
Whisk the flour, milk, eggs and 2 teaspoons salt in a medium bowl until smooth\u2014be sure not to over mix. Let sit for 30 minutes.    
Meanwhile, spoon 1 teaspoon beef fat into each hole of a 12-cup muffin tin. Place the tin in the oven and cook until the fat melts and the pan is very hot, 5 to 6 minutes. Working quickly, pour the batter evenly into the muffin tins,  filling each tin about halfway. Bake until the puddings are golden brown and very puffed, about 20 minutes. Serve immediately.    
