Green and Yellow Bean Salad with Ricotta Salata

Bring a large saucepan of salted water to a boil and fill a large bowl with ice water. Add the green beans to the saucepan and boil until just tender, about 5 minutes. Using a slotted spoon, transfer the beans to the ice water. Return the water to a boil. Add the yellow wax beans and cook until just tender, 5 to 6 minutes. Transfer to the ice water and let cool. Drain the beans and pat dry with paper towels. In a large bowl, whisk the olive oil with the vinegar and shallots. Add the beans, tomatoes, olives and half of the ricotta salata and toss; season with salt and pepper. Transfer the salad to plates, sprinkle the remaining cheese on top and serve.