Heat the oil in a medium sauce pan over medium heat. Add the onion and sauté until tender and pale golden, about 4 minutes. Add the garlic and sauté until fragrant, about 30 seconds. Add the ketchup, pineapple, orange juice, soy sauce, cilantro, green onions, cumin, and sesame oil. Cook uncovered over medium-low heat until the pineapple softens, the mixture thickens and the flavors blend, stirring occasionally, about 15 minutes. Season the sauce to taste with salt and pepper.
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