Ingredients with Measurements:
- 2 cups all-purpose flour
- 1 teaspoon baking powder
- 1 teaspoon baking soda
- 1/2 teaspoon salt
- 1/2 cup butter, softened
- 1/2 cup white sugar
- 1/2 cup brown sugar
- 2 eggs
- 1 teaspoon vanilla extract
- 1/2 cup buttermilk
- 1/2 cup chopped walnuts

Special Equipment Needed:
- Mixing bowl
- Electric mixer
- 9-inch round cake pan

Step-by-Step Instructions:
1. Preheat oven to 350°F. Grease and flour a 9-inch round cake pan.
2. In a medium bowl, sift together the flour, baking powder, baking soda and salt.
3. In a large bowl, cream together the butter and sugars until light and fluffy.
4. Beat in the eggs one at a time, then stir in the vanilla.
5. Gradually beat in the dry ingredients alternately with the buttermilk.
6. Fold in the walnuts.
7. Pour the batter into the prepared pan.
8. Bake for 30-35 minutes, or until a toothpick inserted into the center of the cake comes out clean.
9. Allow to cool in the pan for 10 minutes, then turn out onto a wire rack to cool completely.

Time:
Preparation Time: 15 minutes
Cooking Time: 30-35 minutes
Temperature: 350°F
Serving Size: 8-10

Nutritional Information:
Calories: 330
Fat: 15g
Carbohydrates: 41g
Protein: 5g

Substitutions for Ingredients
- For the all-purpose flour, you can use whole wheat flour or a gluten-free flour blend.
- For the butter, you can use margarine or coconut oil.
- For the white sugar, you can use coconut sugar or maple syrup.
- For the eggs, you can use flax eggs or a vegan egg replacer.
- For the buttermilk, you can use almond milk or coconut milk.

Variations:
- For a chocolate version, add 1/2 cup cocoa powder to the dry ingredients.
- For a lemon version, add 1 teaspoon lemon zest and 1/4 cup lemon juice to the batter.

Tips and Tricks:
- Make sure to cream the butter and sugars together until light and fluffy. This will give the cake a light and airy texture.
- Make sure to sift the dry ingredients together before adding them to the batter. This will ensure that the cake is light and fluffy.

Storage Instructions:
Store the cake in an airtight container at room temperature for up to 3 days.

Reheating Instructions:
Reheat the cake in the oven at 350°F for 10 minutes, or until warmed through.

Presentation Ideas:
- Serve the cake with a dollop of whipped cream and fresh berries.
- Dust the cake with powdered sugar and serve with a scoop of ice cream.

Garnishes:
- Chopped walnuts
- Chocolate chips
- Sprinkles

Pairings:
- Coffee
- Tea
- Milk

Suggested Side Dishes:
- Fruit salad
- Green salad
- Roasted vegetables

Troubleshooting Advice:
- If the cake is too dry, add a few tablespoons of buttermilk to the batter.
- If the cake is too dense, make sure to cream the butter and sugars together until light and fluffy.

Food Safety Advice:
- Make sure to use fresh ingredients and follow food safety guidelines when preparing this recipe.
- Store the cake in an airtight container at room temperature for up to 3 days.

Food History:
Orion is a traditional cake from the United Kingdom that dates back to the 19th century. It is a light and fluffy cake that is often served with tea or coffee.

Flavor Profiles:
Orion has a light and fluffy texture with a subtle sweetness from the white and brown sugars. The walnuts add a nutty flavor and crunchy texture.

Serving Suggestions:
Orion is best served with a dollop of whipped cream and fresh berries. It can also be served with a scoop of ice cream or a drizzle of chocolate sauce.

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Taste: Savory, Salty, Umami, Herby, Tangy, Robust