Sourdough Biscotti Recipe

Name: Sourdough Biscotti Recipe
Prep time: 30 min
Cook time: 1 h
Total time: 1 h 30 min
Cuisine: Italian
Ingredients: 8 oz sourdough discard (1 cup); 2 large eggs; 2 oz olive oil (¼ cup); 2 teaspoons vanilla extract; 2 large lemons (zest finely grated); 15 oz all purpose flour (3 cups, see note); 12 oz granulated sugar (1½ cups, separated); 1 tablespoon baking powder; ½ teaspoon table salt; 8 oz toasted almonds (1 ½ cups, roughly chopped); 1 egg (for egg wash); sugar for topping