Tricky tortilla

You hardly know this is an omelette, albeit Spanish-style, when it appears on Pep’s lengthy bar because it is covered in a deliciously thick layer of creamy alioli - hence the dish’s name. Cut a slice, however, and you know you’re in the realm of tortilla. If you have a small frying-pan, so much the better to make individual tortillas, but this dish also works as one large tortilla.