Cubed Beef Wok Tossed With Black and Green Pepper: Bo Luc Lac

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2 tablespoons oyster sauce

1 tablespoon hot water

1 teaspoon sesame oil

1 teaspoon sugar

1 pound beef sirloin, cut into 1/2-inch cubes

1 tablespoon vegetable oil

1 clove garlic, finely chopped

1/2 small onion, cut into large dice

3 1/2 tablespoons butter

Pinch salt and freshly ground black pepper

2 fresh coriander (cilantro) sprigs, for garnish

Steamed jasmine rice, for serving