White Corn Agnolotti

Name: White Corn Agnolotti
Ingredients: 1/2 cup chicken stock; 2 sprigs of sage, leaves chopped; 6 ounces, or 1 1/2 sticks, butter; Salt and pepper, to taste; 100 agnolotti, recipe follows; White truffles; 1 cup heavy cream; 4 ears white corn, grated through medium holes from a box grater, about 2 cups; 1 teaspoon kosher salt; 1/4-teaspoon fresh ground black pepper; 1 teaspoon sugar; 1 ounce goat cheese; 3 ounces mascarpone; 1/8 cup grated Parmesan; 1 teaspoon fresh thyme leaves, minced; Pasta dough, recipe follows; 3 cups flour; 8 egg yolks; 1 teaspoon extra-virgin olive oil; 2 to 3 tablespoons water; Semolina or all-purpose flour, for dusting