Key West Barbecue Sauce

I've had a couple of request for this barbecue sauce. So here is the recipe. Makes 10 cups. You'll have plenty to freeze to use later over any meat on the grill.

3 cups ketchup
2 cups (packed) dark brown sugar
3/4 cup mango juice or nectar
3/4 cup fresh or frozen reconstituted passion fruit juice blend
3/4 cup orange juice
3/4 cup pineapple juice
1/2 cup golden syrup
1/2 cup lime juice
1/2 cup lemon juice
1/2 cup grapefruit juice
1/4 cup finely grated onion
1 1/2 tbl dry mustard
1 1/2 tsp ground white pepper
1/2 tsp cayenne pepper
1/2 tsp coarse kosher salt
1/2 tsp ground cumin
2 tbl plus 2 tsp cornstarch

Whisk all ingredients except cornstarch in heavy large saucepan. Transfer 1/4 cup sauce mixture to small bowl; add cornstarch and stir until dissolved. Which cornstarch mixture into sauce mixture. Cook over medium-high heat until sauce comes to boil, stirring constantly. Boil sauce 1 minute. Serve warm or at room temperature.