Early Europeans ate seaweed for thousands of years
Some of us still do! In Northern Ireland, we have a lesser-known seaweed dish called Dulce.https://www.bbc.com/travel/article/20180522-the-renaissance-...It's tricky to find it fresh, you usually only get it in small greengrocers or at the Auld Lammas fair. Used to be quite cheap for a bag. Very salty but quite edible and said to be nutrient-dense.