Coat your pork pieces in cornstarch.

Heat up the oil in a large skillet over medium high heat.

Brown the pork quickly in the pan. We are not looking to cook the pork through, just get a little color on each side.

Place the browned pork in the slow cooker.

Add the chopped bell peppers, onion and pineapple (reserve the juice).

In a small mixing bowl combine the sugar, brown sugar, pineapple juice, vinegar, soy, ketchup, garlic, ginger and pepper .

Pour the sauce over the pork in the slow cooker and stir.

Cook on low for 4 hours, stirring once or twice to make sure the sugars are not burning.

Garnish with scallions and sesame seeds and serve over white rice.