Avocado toast is a type of open sandwich or toast with mashed avocado, salt, black pepper, and citrus juice. It was started in the NYC cafe as a trend. Spread a thick layer of mashed avocado over your toast, all spreaded smooth and mounded, heat a skillet and place the toast on it, you can even layer it with olives, tomatoes and other preferred veggies of your choice and ta da the famous treat is ready.