In blender combine avocados, green onions, garlic, cilantro, jalapenos and juice and Tabasco process until smooth. Add sour cream and process again. Stir in the butter mild and chilled chicken broth taste for salt cover and refrigerate until very cold. Garnish with sour cream and chopped green onions. (green part only) Garnish with sour cream and finely grated green onions (green part only)