1/4 cup soy sauce
1 1/2 teaspoons sugar
2 teaspoons toasted sesame oil
2 teaspoons cornstarch
2 boneless chicken breasts, about 1 pound, cut into 1/2-inch cubes
3 scallions, roughly chopped, plus extra to serve
3 garlic cloves, minced
1-inch piece fresh ginger, roughly grated
2 ounces smoked sausage, such as Chinese lapchang or good Italian salami, cut into 1/4-inch cubes
10 ounces fresh shiitake mushrooms, caps thinly sliced
1 tablespoon canola or peanut oil
2 cups Chinese long grain rice
1 teaspoon salt
4 cups chicken stock