Defrost the clams and wash them thoroughly. Peel the garlic and press it through a garlic press. Finely chop the olives. Heat the fat. Sauté garlic and olives. Fry the mussels and prawns for about 5 minutes.
Deglaze with white wine and stock. Cover and cook for about 10 minutes. Add cream and soup paste and bring to the boil. Season to taste with salt, pepper and lemon juice.