Spanish Potato Omelet (Tortilla de Papa Espanola) with Romesco Sauce Recipe | Epicurious

Ingredients

• 1 large Spanish onion, thinly sliced
• 4 medium russet potatoes, peeled, sliced 1/8-inch thick
• 3/4 cup extra virgin olive oil
• 8 large eggs
• Kosher salt
• 1 cup almonds, skins removed
• 1 cup hazelnuts, skins removed
• 1 slice white bread
• 5 to 6 garlic cloves, peeled
• 1 large red bell pepper, halved and seeded
• 2 plum tomatoes, halved
• 1 tablespoon sherry vinegar
• 2 tablespoons flat-leaf parsley, chopped
• 1/2 teaspoon smoked Spanish paprika
• 1/4 cup extra virgin olive oil, plus more if needed
• Kosher salt and freshly ground black pepper