Toasted Walnut Torte with Pear and Orange

Name: Toasted Walnut Torte with Pear and Orange
Ingredients: 14 ounces shelled walnuts; 2/3 cup [plus 1 tablespoon] granulated sugar, divided; 1 tablespoon vegetable oil; 1 tablespoon Grand Marnier or similar orange liqueur; 4-5 small pears (ripe but not mushy, preferably Bartlett); 1/4 cup flour (whole wheat, all purpose, or a gluten-free blend); 3 eggs at room temperature, separated; 1 teaspoon pure vanilla extract; 1/2 teaspoon vanilla bean paste, or seeds scraped from 1 medium vanilla bean pod; finely grated zest of one medium to large orange; 1/4 teaspoon baking powder; 1/2 teaspoon salt