Creamy Fennel Soup

• 1 fennel bulb
• 1 sliver garlic
• 1 lemon zest
• 950 ml nonfat yogurt
• 280 gr defatted beef
• 18 gr shallots (chopped)
• 16 ml lemon juice
• 2 gr coriander (ground)
• 1 gr dillweed (dried)