Stuffed Swiss Chard

Name: Stuffed Swiss Chard
Ingredients: 3 large bunches Swiss chard; Coarse salt; 3 tablespoons unsalted butter; 2 tablespoons extra-virgin olive oil; 2 small leeks, white and pale-green parts only, trimmed, finely chopped, and well washed; 6 medium scallions, white and pale-green parts only, thinly sliced crosswise; Freshly ground pepper; 6 tablespoons pine nuts, toasted; 3 cups cooked short-grain brown rice; 1 1/4 cups finely grated aged provolone; 6 tablespoons fresh ricotta cheese; 3/4 cup fresh breadcrumbs; Fresh Tomato Sauce for Stuffed Swiss Chard