I had the same problem...I have cooked it for an hour and it is just like a thin syrup. I agree that the flavor is good.. I have to think of something to thicken it with.. maybe tapioca..
I made this the second time and came out somewhat thicker. Cooked the citrus and peppers until there was no liquid left in the pan. I love the flavor and have found that it works for other things.. love it on pork chops or tenderloin. Its good drizzled over vanilla ice cream. it also works on crackers and cheese. I will make it again and add a little more red pepper flakes.