Avocado Cilantro Soup

• 8 scallions
• 4 pared avocado
• 2 garlic (cloves)
• 350 ml nonfat yogurt (plain)
• 120 ml skim buttermilk
• 30 ml lime juice
• 8 gr cilantro leaves (fresh)
• 1 gr curry powder
• 1 gr pepper (ground red)