Reduce the heat to low then whisk in the butter, bit by bit, until incorporated. Remove from the heat, taste, and adjust seasoning, if necessary. Preheat a grill to medium. To grill the fish, brush the fish all over with the olive oil and season the fish with the Essence. Grill the fish, basting occasionally with additional olive oil for about 8 minutes. Turn the fish and grill briefly on the second side. Return the court bouillon to the heat, add the fish, and simmer until just cooked through, about 3 to 4 minutes longer. To serve, spoon 1/2 cup of rice into the center of six large soup bowls and divide the red fish court bouillon equally among them. Serve immediately, garnished with parsley or green onion.