Q: I need a recipe for a Spanish Omelette?
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The sauce is a tomato sauce with sauteed onions and sweet peppers, garlic/basil/oregano, chopped olives and a little red wine, in a typical French style omelette -- according to Katzen's Enchanted Broccoli Forest.
Or do you mean the Spanish Tortilla, with eggs, onions and potatoes. Look for that on food52, with chorizo.