The combination of beets and avocado make a perfectly balanced and delicious salad.
Place a medium-sized saucepan filled with water over high heat and bring to a boil. Add the beets, bring back to a boil then reduce to medium heat. Simmer until the beets pierce easily with the point of a sharp knife, about 25 minutes.
Remove the beets from the pan and place under cold running water until cool enough to handle. Peel the beets with a vegetable peeler and cut into ½-inch wedges. Place the beets in a large salad bowl.
Add the tomato, avocado, onion, oil, vinegar, salt, and pepper to the bowl. Toss well to combine. Sprinkle with the basil and chives, and serve.