Slow cooker sweet & sour meatballs

1 pound frozen meatballs
1/2 onion, sliced
2 red peppers, diced
1 can pineapple (chunks or tidbits), undrained 

2 inch knob of ginger, minced

1/2 cup soy sauce

1/4 cup brown sugar

1 T rice wine vinegar

1 1/2 tsp chopped chili pepper (I just squirt in some chili sauce...like sriracha to taste)

1 tsp cornstarch mixed with 1 tsp water

1/2 tsp sesame oil

Hot cooked rice

Mix pineapple juice, ginger, soy sauce, brown sugar, vinegar, cornstarch/water, and sesame oil in a pan and bring to a boil. Place other ingredients in slow cooker and pour sauce over all. Cook on low 6-7 hours. Add pineapple at the end. Serve with hot rice.