I'm not sure if we're thinking of the same thing.
But Here's a recipe for frunch from bomas and it seems to be the same thing your talking about. We liked it so much that we came home and made it.
Ingredients:
1 1/2 cups mango juice
1/2 cup pineapple concentrate, thawed
1/2 cup lemonade concentrate, thawed
2 cups fresh orange juice
3 cups water
4 Tablespoons grenadine
Method:
Mix all ingredients together. Serve over ice in a tall glass. Serves 8.