Add peas and water to a blender and blend until smooth.
Add the avocado, ½ the basil leaves, lemon juice, garlic and black pepper. Blend just until the avocados are broken up and creamy.
Add the remaining basil and walnuts. Blend for just a few seconds until the basil and nuts are chopped to small pieces.
Serve or store in an airtight container for later use. Best eaten within 1 to 2 days.
