4 tbsp vegetable oil or beef drippings from roast.
Combine eggs, milk, flour and salt in a mixing bowl
Whisk ingredients until well combined
Place in refridgerator for 30 minutes until ready to use
Preheat oven to 425F
In each muffin tray pour 1 teaspoon of vegetable oil or beef drippings
Place muffin tin in oven and heat until very hot
Remove muffin tray from oven and fill each tin 3/4 fill with the batter. As you pour batter it should sizzle.
Quickly return to oven and bake for 20 minutes. Cooking time may vary so check around 15 minutes. Do not open oven until baked as they may fall flat. Yorkshire puddings should be well risen and brown.