Lobster And Mango Cocktail

• 24 chives for (whole garnish)
• 12 leaves
• 4 belgian endives (whole plus)
• 3 firm-ripe mangoes
• 3 chives (minced fresh plus)
• 1 1/2 live lobsters
• 1 day in advance
• 3/4 melonball cutter
• 100 gr celery (finely diced)
• 80 ml yogurt (plain)