Put into the blender goblet: 150 g black olives (stoned), 150 g tuna in oil, 4 tablespoons olive oil, 2 tablespoons lemon juice, 1 teaspoon Mustard, 5 anchovys fillets, salt and pepper.
Start the blender and add 6 tablespoons olive oil, pouring it in a thin stream. Blend until it forms a smooth purée.