Preheat a gas or charcoal grill on high heat.
Rub the corn with olive oil. Grilled the corn until it is lightly charred, about 5-7 minutes. Let the corn cool before slicing the kernels off the cobs.
In a small saucepan over high heat, combine the farro and water. Bring to a boil, reduce the heat and simmer the farro for 12-15 minutes until the grains are tender but still chewy. Pour into a fine mesh strainer to drain the remaining water.
Remove the fava beans from their pods. In a large saucepan of boiling salted water, cook the fava beans for 3-4 minutes until tender. Transfer them to a bowl of ice water. Once the fava beans have cooled, remove their outer skins.
In a large bowl, gently fold together the corn, farro, fava beans, scallions, walnuts, pecorino and baby arugula & spinach.
For the vinaigrette, combine the lemon juice, mustard, salt and pepper in a small bowl. Whisk in the olive oil until fully combined.
Stir the vinaigrette into the farro and season to taste with salt and pepper.