Southwestern Grilled Cacti Soup

• 20 tbs
• 4 tbs butter
• 3 nopalitos grilled
• 1 1/2 sticks
• 1 stick
• 1 onion (yellow chopped)
• 1/2 one (garnish)
• 1,400 ml chicken stock
• 700 ml chicken stock (hot)
• 240 ml milk