Mix cornstarch, broth, soy, sugar, garlic powder and ginger in saucepan. Cook and stir until mixture boils and thickens.
Thread alternately pork, mushrooms and onion on 4 skewers.
Grill or broil kabobs 20 min. or until done, turning and brushing often with broth mixture. Thread 1 tomato on each skewer.
Heat remaining broth mixture to a boil. Serve with kabobs and rice.
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