Shrimp with Secret Sauce

My daughter-in-law is a fantastic cook, as is her mom,  and her mother taught her this recipe which they often used with fish. The first time we had the dish it was with tilapia. I had some nice shrimp to use so I decided to try the sauce and I have to tell you this was totally delish. I don't really have exact measurements because my DIL doesn't really measure, she tastes and then adjusts. Like I said she is a kick ass cook. I sort of winged this and the outcome was great and I'm sure she would be proud of me :-) I served the shrimp with brown basmati rice and sautéed spinach.

1 lb shrimp, shelled and deveined
2 small tomatoes, chopped
1/2 onion, chopped
1 bunch scallions, chopped
4 garlic cloves, peeled and sliced
1 or 2 jalapenos, chopped

white wine vinegar
oyster sauce
sesame oil

In wok, drizzle some sesame oil, heat and quickly sauté the shrimp. Remove to bowl. Next stir fry the tomatoes, onions, scallions, garlic and peppers. After they have cooked down a bit, pour in some vinegar and oyster sauce (maybe 1/4 cup each??) or less and stir around. Add the shrimp back in and stir.

Serve over rice--yum