Unsalted Butter (1/2 cup)
to soften at room temperature.
Sea Urchins (4)
in a fine sieve and press through the mesh into a bowl using a rubber spatula.
Place butter and sea urchin paste into the bowl of a food processor.
Shallots (1 Tbsp)
Add minced shallot, lemon zest,
Salt (to taste)
Ground Black Pepper (to taste)
to the food processor.
Blend the mixture until smooth. Transfer to a bowl and chill in the refrigerator until firm enough to work with, about 1 hour.
Lay the butter out onto a piece of plastic wrap and roll into a log shape about 1½ inch in diameter
Return butter to the refrigerator to chill until solid, or seal tightly and freeze to use later.