Preparation:
        
         
          
          This recipe uses a 10-inch tube pan
            Have all ingredients about 70°F (21°C). 
            Preheat oven to 325°F (165°C).
        
         
          Making a cake:
        
        
          - Sift twice:
        
         
          
          
            
              - 1 1/2 cup sifted cake flour 
              (195 grams)
              
- 1 teaspoons double-acting baking powder
              
- 2/3 teaspoon salt
            
 
- Beat 6 egg yolks in a large bowl until 
            pale. Gradually add and beat:
        
         
          
          
            
            
        
        
         
          
- Fold in and beat:
        
         
          
          
            
              - 1/2 cup + 1 tablespoon 
              vegetable oil 
              
- 3/4 cup freshly squeezed orange juice  (about 
              2 or 3 oranges)
              
- 2 orange zest (about 2 tablespoons)
              
- 2 teaspoon vanilla
            
 
- Add the dry ingredients all at once and beat until smooth:
        
         
          
          
            
            
        
         
          
- In a separate bowl, beat until somewhat foamy: 
        
         
          
          
            
          
        
         
          
- Add 1/3 cup sugar gradually and continue to beat until soft peaks 
              form.  Be careful not to over-beat the egg whites, because if they become too stiff and dry it becomes 
              harder to blend in the yolk mixture in the next step.
        
        
         
          
          
            
            
          
         
         
          
- Add 1/4 of the egg whites into the flour and yolk 
              mixture with a spatula or wire whisk , not with an electric beater. 
              Mix gently until the color is uniform. Add the rest of the egg whites 
              and fold in just until blended. Over-mixing will cause deflation 
              of the batter.
        
         
          
          
            
            
        
         
          
- Pour the batter into an un greased 
              10-inch tube pan and bake at 325°F (165°C) for 1 hour or until a wooden 
              skewer inserted into the center of the cake comes out clean. Immediately 
              after removing the cake from the oven invert the pan and place on 
              a bottle or flat surface.
          
        
         
          
          
            
            
        
         
          
- Let the cake cool completely before removing from pan.
        
         
          
          
            
          
Making glaze: 
        
        
        
          - Place on top of the cake:
        
         
          
            
              - 2/3 cup toasted chopped walnuts (60 g)
              
- 2 tablespoons chopped orange peel (optional)
            
 
- In a small pan stir the following ingredients together over the lowest heat setting for 3 minutes.
            Alternatively, you can use a double boiler setup to heat the ingredients:
        
         
          
          
            
              - 1 cup powdered (confectioners or icing) 
              sugar
              
- 2 teaspoons melted butter
              
- 2 orange zest (about 2 tablespoons)
              
- 2 tablespoons freshly squeezed orange juice
            
 
- Remove from heat and add:
        
         
          
          
            
              - 1 tablespoon Grand Marnier (or orange liqueur)
            
 
- Beat until smooth and syrupy. Pour immediately over 
            the cake before the glaze becomes hard. If it does become too hard, add a very small amount of 
            water to the right consistency.