Combine in a food processor the avocado, 2 Tbsp. red onion, lime juice, olive oil, 1/4 cup cilantro and salt and pepper to taste. Puree until still chunky.
Oil your grill pan and oil each side of the scallops, season with salt and pepper. Heat the grill pan on the grill on medium high. Grill the scallops until golden brown, 2-3 min. per side.
Serve the scallops over the pureed avocado and garnish with the 1 Tbsp. red onion and some chopped cilantro.
Nutrition calculation is an estimation only. If you need nutritional calculations for medical reasons, please use a source that you trust.