Slow Cooker Sweet and Sour Meatballs
Juicy meatballs, sweet pineapple chunks, and colourful bell peppers cooked low and slow in a glossy, tangy-sweet sauce. Minimal prep, maximum crowd appeal — serve over steamed rice for a complete weeknight dinner.
- 24 oz frozen fully cooked meatballs
- 1 can (20 oz) pineapple chunks, drained (reserve the juice)
- 1 cup bell peppers, sliced (any colour)
- ¾ cup brown sugar
- ½ cup rice vinegar or apple cider vinegar
- ½ cup ketchup
- 3 tablespoons soy sauce
- ¼ cup water
- 2 tablespoons cornstarch
- Add the frozen meatballs, sliced bell peppers, and drained pineapple chunks directly to the slow cooker insert. There is no need to thaw the meatballs first — they will heat through completely during the cook time and stay juicier going in from frozen than if thawed in advance.
- In a large bowl, combine the reserved pineapple juice, brown sugar, vinegar, ketchup, soy sauce, water, and cornstarch. Whisk vigorously until the cornstarch is completely dissolved and the sauce is smooth with no lumps — undissolved cornstarch will clump rather than thicken the sauce evenly. The sauce will look thin at this stage, which is normal; it thickens significantly as it heats.
- Pour the sauce mixture over the meatballs, peppers, and pineapple, then use a spoon to stir and coat everything evenly. Cover with the lid and cook on low for 4 to 5 hours, or on high for 2 to 3 hours. The dish is ready when the meatballs are heated through, the peppers have softened, and the sauce has thickened to a glossy, coating consistency. Give everything a gentle stir before serving to redistribute the sauce.
Chef’s Note: The cornstarch is doing the thickening work here, and how you add it matters. Whisking it directly into the cold sauce mixture before cooking ensures it disperses evenly throughout the liquid rather than forming pockets. As the slow cooker heats the sauce over several hours, the starch granules absorb moisture and swell, gradually transforming the thin liquid into the glossy, lacquer-like coating that makes this dish so appealing. The reserved pineapple juice is not an afterthought — it carries concentrated tropical sweetness and acidity that the plain water alone cannot replicate, and it is the element that makes the sauce taste layered rather than one-dimensional. Do not discard it when draining the can.
This dish is as flexible as it is easy. Any colour of bell pepper works, though a mix of red, yellow, and green makes the finished bowl particularly vibrant. Serve the meatballs and sauce over steamed jasmine rice to soak up the glossy sauce, or alongside egg fried rice for something more substantial. For a party or gathering, keep the slow cooker on the warm setting and serve directly from the insert with toothpicks as a starter — the sticky, tangy-sweet sauce means they disappear quickly. Leftovers keep refrigerated for up to three days and reheat well on the stovetop or in the microwave with a splash of water to loosen the sauce.
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