01 - In a medium mixing bowl, combine cranberries, jalapeño, red onion, cilantro, lime juice, granulated sugar, and salt. Stir thoroughly and allow the mixture to rest for 10 minutes so the flavors can meld.
02 - Taste the salsa, and if needed, adjust with additional sugar for sweetness or more lime juice for added tang.
03 - Arrange the endive leaves neatly on a serving platter.
04 - Spoon about 1 to 2 teaspoons of cranberry jalapeño salsa into the base of each endive leaf.
05 - Serve immediately, or refrigerate the salsa for up to 2 hours and fill the endive leaves just prior to serving.