Does anyone have any idea what this is used for? Seems like a waste

2-3 lb pork loin roast
1 sliced onion
2 tbsp extra virgin olive oil
½ cup dark brown sugar
¾ cup apple cider vinegar
½ cup honey
¼ cup soy sauce
2 tsp salt
3 minced garlic cloves
2 cups diced fresh pineapple chunks
Optional: 1 tsp crushed red pepper flakes
Instructions:

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