1. Chill farro if recently cooked.
2. Add 1/2 of the pesto to the farro. Mix thoroughly. Add more pesto until desired amount of pesto is covering farro.
3. Add walnuts, stir to combine.
4. Add tomatoes, carefully combine into mixture, trying not to break up tomatoes too much.
5. Add diced avocadoes and carefully stir to combine or serve with avocado slices on top.
6. To serve: place small amount of arugula on plate or bottom of bowl. Place farro pesto on top.