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The ripe seeds are great either you boil them it salted water, peel and eat.
Or roast them, peel and add to curries, juts awesome!
A friend recently made them, you can check it out if you want : https://steemit.com/food/@brandyb/jackfruit-seeds-eat-them-and-here-is-how

Sweet thanks for sharing! I'll try that next time we have a ripe jackfruit ;)