Place the eggs, water, salt and pepper into a bowl and lightly whisk with a fork until well combined
Heat the butter in a 20cm heavy based fry pan
Add the egg mixture to the pan
Use the back of the fork to quickly draw the cooked egg from the edge of the pan towards the centre and then tilt the pan so the uncooked egg runs to the edge
Cook until the bottom of the omelette is gently browned and the top is soft and slightly runny
Sprinkle over the herbs and cheese
Use the fork to lift one side of the omelette and fold it over the other side to enclose the filling
Slide the folded omelette onto a plate and serve immediately
