Chinese Beef With Broccoli

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2 tablespoons cornstarch

4 tablespoons soy sauce

2 teaspoons sugar

5 tablespoons peanut oil

1 pound flank steak, thinly sliced against the grain

1 tablespoon oyster sauce

1 1/4 cups low-sodium chicken broth

4 thin slices peeled ginger

1 head broccoli, cut into florets

1 large onion, halved and sliced 1/2 inch thick

3 plum tomatoes, quartered lengthwise

2 cloves garlic, minced

Cooked white rice, for serving (optional)