Spanish cuisine a signal of piety. The arrival of Europeans in America, in 1492, initiated the advent of new culinary elements, such as tomatoes, potatoes, corn, bell peppers, spicy peppers, paprika, vanilla and cocoa or chocolate. Spain is where chocolate was first mixed with sugar to remove its natural bitterness. Other ingredients traveled to the Americas, such as rice, grapes, olives and many types of cereals. Many traditional Spanish dishes such as tortilla de patata (an omelette made with potatoes), would not be possible without the discovery of America. Gazpacho, salmorejo, and pan tumaca are made with tomatoes, which traveled from America
Vegetable oil refining Vegetable oil refining Vegetable oil refining is a process to transform vegetable oil into biofuel by hydrocracking or hydrogenation. Hydrocracking breaks big molecules into smaller ones using hydrogen while hydrogenation adds hydrogen to molecules. These methods can be used for production of gasoline, diesel, propane, and other chemical feedstock. Diesel fuel produced from these sources is known as "green diesel" or "renewable diesel". The majority of plant and animal oils are vegetable oils which are triglycerides—suitable for refining. Refinery feedstock includes canola, algae, jatropha, salicornia, palm oil, and tallow. One type of algae, Botryococcus braunii produces a different type of