Olive oil, for cooking
2 large shallots (or 1 sweet onion), finely chopped
2 cups farro (uncooked)
4 cups chicken or vegetable stock
1/4 cup red wine vinegar
2 tablespoons olive oil
1 pint cherry or grape tomatoes, halved or quartered
1/2 large English (hothouse) cucumber, diced
1/4 cup finely chopped basil
Kosher salt and freshly ground black pepper