In medium saucepot combine the orange juice with the shallot, ginger, lemongrass, chile de arbol and garlic. Allow the orange juice to reduce by 2/3, then strain sauce and allow it to cool. When sauce is cool, add the lime juice.
With a pair of scissors cut the top of each sea urchin making sure to discard any shell that might have broken loose in the urchin. With a paring knife, scoop and detach the urchin from the shell. When this is done, spoon a little sauce on each urchin, garnish with cilantro leaves and allow to sit for 15 minutes before serving.