Mix the eggs and flour well with a fork, then beat in the milk. Let sit in the fridge about 1/2hr.
Heat the oven to 220C, pour a small amount of oil into each case of a metal muffin tray. Place in the oven till the oil is very hot, then pour in yorkshire pud mixture to about 3/4 full.
Bake about 1/2hr till golden and crisp and well risen