Kosher certified Surströmming or Miracle Fruit?
Do such products exist with kosher certification?
anything that is raw, comes in its natural form is generally fine w/o kosher certification. if something is processed in some way then it isn't. For instance, the grapple, does need certification since it is an apple infused by grape flavor. As for surstromming, have not seen it here. You may want to email a chabad house in scandinavia and ask.