Though tortilla espanola is a great brunch dish, it can also be cut into smaller pieces to make a nice little appetizer or tapas at your next dinner party. Either way, it is a great dish for entertaining that takes very little time to cook.
1/3 cup olive oil
1 pound red potatoes, scrubbed and thinly sliced
1/2 large white onion, thinly sliced
1/2 teaspoon salt