This recipe will fill a 20 by 30 cm roasting tray and yields 4 portions.
Do not wash the peeled potatoes to conserve the starch which will help to set the omelette.
Alternatively, cook he Spanish omelette in a large skillet. Mix the eggs and cream, seasoning with salt and pepper, and mix with the potatoes and vegetables. Wipe the pan clean with some paper towel, melt some butter in the clean pan and pour the egg, potatoes and vegetables in. Compress slightly and allow to cook on a low hit, covered with a lid. When the underside is cooked and the top of the omelette is almost dry, place a large plate on top of the pan and turn them over together. Using the plate, return the omelette to the pan to cook the other side until done. If not cooked enough, the omelette is too fragile to turn. If overcooked, the underside will be too brown. Transfer the omelette to a large plate and serve with a green salad.
Use chorizo instead of pancetta.