Avacado Soup With Green Peppercorns

• 4 ripe avacados
• 2 garlic (cloves)
• 1 onion
• 1 cilantro leaves for (garnish)
• 2,400 ml chicken stock (light)
• 16 ml olive oil
• 6 gr coriander (ground)
• 2 gr cumin
• some pepper to