Set the Anova Sous Vide Precision Cooker to 115°F (46°C).
Season the scallops with salt and pepper. Place in a large zipper lock bag with ¼ cup of the lime juice. Seal the bag using the water immersion technique and place in the water bath. Set the timer for 30 minutes.
Meanwhile, prepare the sauce: Combine cilantro, parsley, basil, cucumber, onion, olive oil, jalapeno, garlic, and remaining ¼ cup lime juice in a food processor. Process until mixture is finely diced, but not fully pureed. Season to taste with salt and pepper.
When the timer goes off, remove the bag from the water bath. Remove the scallops from the bag and cut into ¼-inch-thick slices. Place on a serving plate.
Drizzle sauce over scallops and garnish with fresh herbs and onion slices. Serve.
