Swiss Chard and Goat Cheese Galette

Name: Swiss Chard and Goat Cheese Galette
Ingredients: 12 ounces green Swiss chard, washed, stems removed and reserved; 2 tablespoons extra-virgin olive oil; 1 large onion, sliced lengthwise 1/4 inch thick; 3 tablespoons balsamic vinegar; Coarse salt and freshly ground pepper; 3 anchovy fillets, coarsely chopped (optional); 2 tablespoons fresh thyme leaves; 6 ounces fresh goat cheese, room temperature; 3 tablespoons heavy cream; 1/2 teaspoon freshly grated nutmeg; Oatmeal Tart Dough; 2 tablespoons pine nuts, toasted; 2 tablespoons golden raisins; 1 large egg yolk