What you’ll need:
Prepare an ice bath by emptying a tray of ice cube into a large bowl and adding the 2 tablespoons salt and enough water to cover. Set aside
Bring a large saucepan of water to boil over high heat and salt the water. Add the green beans and cook until crisp-tender, about 2 minutes. Remove from the pan, transfer to the ice bath to cool, then drain. Add chayote to the boiling water and cook until crisp-tender, about 2 minutes. Drain and transfer to the ice bath to cool, then drain again.
In a large bowl, combine the green beans, chayote, tomatoes,oil, lemon juice, and lemon zest. Season with salt and pepper and serve.