My Own Gourmet’s Surprise

Name: My Own Gourmet’s Surprise (Amuse-gourmand à ma façon)
Yield: For four people
Cuisine: French
Ingredients: 1 kg (2¼ lb) freshwater crayfish; 1 lobster, weighing 600-700 g (1 lb 5 oz-1⅔ lb); 8 very thin slices of salmon (like slices of ham); 8 very thin slices of salmon (like slices of ham); 60 g (2 oz) Beluga caviare; 100 ml (4 fl. oz) olive oil; 1 tablespoon chives, chopped; a handful of very fine French beans, cooked; 1 tablespoon vinaigrette; 1 tablespoon white wine vinegar; half a lemon, cut into thin slices; 4 good lettuce leaves, cut into strips; 4 tablespoons mayonnaise; juice of half a lemon; 1 teaspoon green herb mustard; salt, freshly ground pepper; salt, freshly ground pepper