Stir Fried String Beans with Tuna

My choice for one of my lunches few days ago, high in protein and high in fiber but low in calories, delicious and satisfying. I stir fried this to maintain the color of the string beans.  See the photo? It looks fresh, right? That's the art of stir frying :).

Ingredients:
string beans
canned tuna
1 onion

Procedure:
1. Saute the onion then add the tuna simmer for a minute then increase the heat.
2. Add the string beans and stir fry until done.
3. Serve it hot.