Beijing Restaurant Lemon Grass Chicken

Source: San Antonio Express-News - Beijing Restaurant, San Antonio, Texas

Marinade/Meat
1 tablespoon vegetable oil
1/2 white onion, sliced
3 tablespoons finely chopped lemon grass *
2 cloves shallots, chopped
2 cloves garlic, chopped
1 pound (breast or dark meat) chicken, diced (sliced
    beef or pork can be substituted)

To finish
1 tablespoon fish sauce
2 teaspoons soy sauce
Pinch of salt
1 tablespoon granulated sugar
Additional oil for saut