Cook the sausages in the oven for 10 minutes until they are not quite cooked and only slightly browned
While the sausages are cooking make the batter
In a bowl whisk the eggs, flour, milk and salt until there are no lumps, set aside in the fridge
Remove the sausages from the oven, then turn it up to 210°C
Spray the oven tray with a decent amount of low calorie cooking spray, then put it in the oven until it starts to foam (probably about 5 minutes)
Place the sausages in the pre heated tray, give the batter a quick stir and pour it into they tray with the sausages
Cook at 210°C
Do not open the oven door, but after about 10 minutes turn the oven down to just under 200°C and allow to cook for another 5 - 10 minutes (you should be able to take a look after about 15 minutes)
When the Yorkshire Pudding is risen, nicely browned and crisp remove from the oven and serve