2. In a food processor, combine the cilantro, basil, parsley, garlic, vegetable oil, salt, and pepper. Process to make a coarse paste. Pour into a shallow dish.
3. Trim the lemongrass into thin spears. With a sharp knife, pierce holes in the shrimp and scallops. Thread a shrimp and a scallop onto each stalk of lemongrass and place in the cilantro mixture, turning to coat. Marinate in the refrigerator for 1 hour.
4. Grill spears for 1 to 2 minutes per side. Serve in a basket lined with tea leaves.