Preheat oven to 215 C. Sieve the flour into a large bowl and add the eggs, milk and salt then whisk until you have a smooth batter. Set to one side.
Put 1 teaspoon of sunflower oil in each compartment of a Yorkshire pudding tray and place into the oven for 10 minutes.
Once the tray is heated remove from the oven and pour the batter mix into each compartment. Cook on the middle shelf for 15 minutes.