Spanish omelette signed. Upon their release, these prisoners brought part of the culture of Alentejo to Spain, including many recipes, which featured a potato egg pie that evolved into the modern version of "tortilla". Spanish omelettes can range from authentic and carefully made seasoned preparations of raw potatoes of a variety carefully selected for best results, eggs, optional onions and good olive oil and nothing else, to nontraditional preparations with many additional ingredients. Some of the many additions to the base ingredients include green peppers, chorizo, courgette, aubergine, mushrooms, and diced ham. The "tortilla paisana" includes red pepper and peas. The tortilla
Vegetable oil fuel Vegetable oil fuel Vegetable oil can be used as an alternative fuel in diesel engines and in heating oil burners. When vegetable oil is used directly as a fuel, in either modified or unmodified equipment, it is referred to as straight vegetable oil (SVO) or pure plant oil (PPO). Conventional diesel engines can be modified to help ensure that the viscosity of the vegetable oil is low enough to allow proper atomization of the fuel. This prevents incomplete combustion, which would damage the engine by causing a build-up of carbon. Straight vegetable oil can also be blended with conventional diesel