Food & Cooking Recipes Ingredients Seafood Recipes Tonnato Mayonnaise Close Credit: Justin Walker Prep Time: 10 mins Total Time: 2 hrs 10 mins Yield: 2 cups Instead of making this Italian condiment completely from scratch, start with store-bought mayonnaise and jazz it up with capers, anchovies, oil-packed tuna, and lemon juice. Serve with our showstopping Shrimp and Crudite Platter. Directions Puree first five ingredients with 1 teaspoon water in a blender until smooth. With blender running, add oil in a steady stream. Refrigerate in an airtight container at least 2 hours and up to 1 day.