Dice the onion and peppers into approximately 1cm pieces.
Heat the oil in a large non-stick frying pan over medium heat and gently sweat the peppers and onions until soft, about 20 minutes.
Shred the spinach and stir into the vegetables.
While the spinach is wilting, beat together the eggs, water, turmeric, salt and pepper.
Pour over the vegetables and mix well.
Cook over a medium-low heat until the egg mixture has almost set.
Finish under a hot grill to brown the top.
Allow to cool slightly in the pan before turning out onto a plate.