Risotto con Gamberi

Name: Risotto con Gamberi
Ingredients: 2 tablespoons extra-virgin olive oil; 1 pound shrimp, peeled and deveined; 1/3 cup cognac; 4 tablespoons unsalted butter; 1 yellow onion, large dice; 2 stalks celery, large dice; 2 garlic cloves, small dice; 2 cups Arborio rice; 6 cups homemade chicken stock; 1 cup great-tasting dry, white wine; kosher salt and ground pepper to taste; 1 cup mixed colored cherry tomatoes, halved; 1 bunch watercress, stems removed and roughly chopped.; 4 tablespoons grated Parmesan