Add lime juice, pineapple juice, mango , and parsley - cook down for about 5-7 minutes.
In the last minute of cooking, add butter and jalapeno pepper and stir until butter is melted.
Serve over grilled fish or chicken.
Just a Note:I tried this recipe with cilantro instead of flatleaf parsley and found only minor differences. With the flatleaf parsley, I found that the sauce was mild and acted as a flavor enhancer to the fish (grouper). With the cilantro, I noticed it brought out a bright and robust flavor to the sauce and tasted quite nicely in contrast to the mild grouper. Either way, I found it very tasty!