Peanut beef stir fry

Sauce:
1 large onion, sliced
1T grated ginger
peanut butter
garlic, crushed
1.5T sherry
2T soy sauce
1 pinch sugar
1/4 cup chicken stock

Meat:
Beef cut in strips
2 eggwhites
1.5T cornstarch

Stir fry onions and ginger; combine remaining sauce ingredients, add to pan and boil for a bit. Add beef, cook, push to the side, add rest of cornstarch mixture, allow to thicken, then recombine everything and serve.

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What do the food critics say? It was a while ago I made this, but I remember it being good.
What does the cook say? Easy.

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Source: somewhere on the internet. Sorry I didn't write down exact amounts for everything!