Tuscan Beans With Tuna

Name: Tuscan Beans With Tuna
Ingredients: 6 tablespoons extra-virgin olive oil; 3 cloves garlic, thinly sliced; 16 fresh sage leaves (8 chopped, 8 whole); 2 15-ounce cans cannellini beans; 3/4 pound kale, stems and ribs discarded, large leaves torn in half; Kosher salt and freshly ground pepper; 1 cup grape tomatoes, thinly sliced; 3 inner stalks celery, thinly sliced (with some leaves); 1/2 cup chopped pitted kalamata olives; 1/3 cup chopped roasted red peppers; 1 12-ounce can solid white albacore tuna in water, drained