Seaweed Salad (with the stuff washed up on the shore)
It’s a ubiquitous side on the sushi restaurant menu, but “seaweed salad” is just weeds from the sea, tossed with dressing. Often, it’s made from dried and reconstituted seaweed sheets, shred into ribbons. You can get packages of the dried stuff at any Japanese grocery. Or, if you’re at the beach, you’ll come across it, fresh, for sure.