Step 1

Finely grind nori in spice mill; transfer to a small bowl and mix in red pepper flakes, sesame seeds, and 1 tsp. sea salt. Using a Microplane, finely grate zest of lemon half into bowl and use your fingers to work it into nori mixture (this will keep the zest from clumping). Set lemon half aside.

Step 2

Cut radishes into a mix of ¼"-thick rounds and 1"-thick wedges, depending on their size (you just want pieces that are easy to pick up and eat).

Step 3

To serve, spoon crème fraîche onto one side of a platter or large plate and sprinkle furikake over. Pile up radishes on the other side of the platter. Squeeze juice from reserved lemon half over radishes and sprinkle with a bit of sea salt.