Food & Cooking Recipes Ingredients Seafood Recipes Tonnato Mayonnaise Be the first to rate & review! By Martha Stewart Test Kitchen Martha Stewart Test Kitchen The recipes developed by our test kitchen team have undergone a rigorous process of development and testing, ensuring that every element is optimal, from ingredient amounts to method and cooking time. This process includes triple-testing recipes to ensure they meet our high standards. The many stellar cooks and food editors who have been part of our team include Sarah Carey, Lucinda Scala Quinn, Jennifer Aaronson, Shira Bocar, Anna Kovel, Greg Lofts, Riley Wofford, Lauren Tyrell, and Lindsay Leopold. Editorial Guidelines Updated on November 30, 2018 Print Rate It Share Share Tweet Pin Email Photo: 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. Ingredients 1 cup mayonnaise 2 tablespoons capers, rinsed 2 small anchovies, rinsed and mashed (1 ½ teaspoons) 1 jar (7 ounces) oil-cured tuna, drained 2 tablespoons fresh lemon juice ⅓ cup extra-virgin olive oil 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. Rate it Print