Combine the jalapeno, pineapple and juice, lime juice and zest, yogurt sugar, red pepper flakes and salt in a food processor. Pulse until well blended.
Transfer to a serving dish or storage dish and chill for 30 minutes or until ready to use. Give it a good stir before serving.
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Notes
For a thicker sauce, use less or no pineapple juice. For a thinner sauce, use all of it!