In a food processor, combine the avocado and peas and process until smooth. Add the broth, scallions, lemon juice, sour cream and 3 tablespoons of the salsa. Process until combined. Season to taste with salt and pepper. Transfer to a bowl, cover, and refrigerate for at least 2 hours. Ladle into small cups, garnish with a spoonful of the remaining salsa, and serve at once.