Potato Spanish Tortilla (Tapas)

I got this recipe from a book I bought when I went to visit my grandpa who lives in Spain. I'm proud to have Spaniard blood:D! I'm a whole cultural mix :P It's fun ;)! Enjoy it...

• Ready In: 40 mins
• Serves: 4-8

Ingredients

• 6  eggs
• 2  onions
• 4 -5  potatoes
• 3  tablespoons olive oil
•  salt and pepper, to taste

Directions

1. Peel and cut the potatoes in cubes; cut the onions in thin slices (or as you wish).
2. Beat the eggs in a bowl and set aside.
3. Heat the oil in a deep skillet and, in low heat, saute the potatoes and onions for about 10-15 minutes. Season as you wish; remove excess oil from potatoes n onions then mix these into the eggs.
4. In a separate skillet, heat 4 tablespoons of olive oil and when hot enough, add egg mixture. Let it set for around 5 minutes (until it starts to harden -- ). You have to flip it (probably the most troublesome part -- I use a large plate to help myself flip the tortilla) and then cook the other side pretty well (for about 5 minutes).
5. You can serve hot or cold because it's a tapa! :D.