Tortilla Española With Blistered Cherry Tomato Romesco

Name: Tortilla Española With Blistered Cherry Tomato Romesco
Cuisine: American, Spanish
Ingredients: 1 medium white onion, very thinly sliced; 1 medium red bell pepper, very thinly sliced; Kosher salt and freshly ground black pepper; 1 cup extra-virgin olive oil, divided; 1 1/2 pound waxy potatoes, unpeeled and very thinly sliced; 8 large eggs, beaten to blend; 1 pint cherry tomatoes; 6 cloves garlic, skin-on; 1/2 cup raw almonds; 1 to 2 tablespoon sherry or red wine vinegar; 1 to 2 tablespoon pimentón (smoked Spanish paprika), to taste; Chopped parsley, Manchego slivers, crusty bread, and olives (for serving)