In large bowl, combine ground pork,ground shrimp,scallion,shredded carrots, egg,salt,pepper,oyster sauce,sesame oil,corn starch. mix all well and even.
Heat oil in frying pan, make small balls of meat mixture and fried until golden brown, set a side.
In other pan, saute garlic, add tomato sauce, water,sugar,pineapple, let it simmer.
In a small cup, dilute corn starch with water.
While the sauce is simmer, add the corn starch water, let it boiled and thicken.