DIRECTIONS. How to Make Cucumber Tomato Avocado Salad: 1. Prep time: 10 minutes Cook time: 10 minutes Servings: 10 Ingredients. Toss gently to combine. Cut the tomatoes into small cubes, roughly slice the red onions. mix with olive oil, add salt and ground pepper. In a bowl, prepare the dressing by first dissolving salt into lemon juice. 2. Wash fresh coriander and chop with a knife. 1 pint halved cherry tomatoes ; 1 diced into 1/2 inch pieces avocado ; 2 cup cooked fresh or frozen corn ; 1/2 cup finely diced red onion 2. With a vegetable peeler, carefully remove peel from lemon, leaving white pith behind. If you aren’t keen on cilantro, fresh dill is a good substitute. P.S. Drizzle with 2 Tbsp olive oil and 2 Tbsp lemon juice. Place chopped tomatoes, sliced cucumber, sliced red onion, diced avocado, and chopped cilantro into a large salad bowl. Place tomatoes and cilantro in large bowl. Instructions. Toss with tomatoes. 1.