Food & Cooking Recipes Appetizers Avocado, Caper, and Pickled-Onion Toast 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 May 16, 2017 Print Rate It Share Share Tweet Pin Email Servings: 2 Tangy red onion, creamy avocado, and salty capers come together in this quick tartine. Ingredients ¼ small red onion, thinly sliced ½ teaspoon fresh lemon juice ½ teaspoon capers, coarsely chopped 1 teaspoon extra-virgin olive oil kosher salt and ground black pepper 1 teaspoon lemon zest ½ avocado, pitted 2 slices whole-grain bread, toasted 1 ounce smoked trout or ½ soft-cooked egg, for topping (optional) Directions Combine the onion, lemon juice, capers, oil, and 1/4 teaspoon salt and pepper in a bowl. Let stand until the onions soften slightly, about 10 minutes. In another bowl, mash the lemon zest and avocado with 1/8 teaspoon salt. Spread half of the avocado mixture on one slice of toast and top with half the onions. If desired, add either the smoked trout or the soft-cooked egg. Repeat with remaining ingredients, and serve immediately. Rate it Print