You may want to give this another shot by making your own grenadine. The Waldorf Astoria Cocktail book has a great recipe - combine and heat 12 oz pomegranate juice, 12 oz of brown sugar, and the peels from two oranges. Heat just long enough to bring to a boil and immediately take off the burner. Let ingredient steep for 3-5 min and strain. Bottle in a sterile jar with a splash of everclear to keep for a little longer in the fridge. Keeps up to a month. Do that and give this drink another go ;)