Creating an Almond Orange Biscotti Cake that can serve 50 people will require a good-sized batch. Below is the recipe specifically scaled for such an occasion. This cake features the lovely combination of almond and citrus flavors, reminiscent of traditional Italian biscotti.

Ingredients

• 500g all-purpose flour
• 400g granulated sugar
• 250g unsalted butter, softened
• 6 large eggs
• 200g almond flour
• 200ml orange juice (freshly squeezed for best flavor)
• Zest of 3 oranges
• 100g sliced almonds
• 15g baking powder
• 1 tsp salt
• 2 tsp almond extract
• 2 tsp vanilla extract

For the Glaze (optional):

• 150g powdered sugar
• 3-4 tbsp orange juice
• Additional orange zest for garnish

Instructions

1. Preheat Oven and Prepare Pans:

• Preheat your oven to 180°C (350°F).
• Grease and flour two large 9×13 inch cake pans or a similar volume setup.

1. Mix Dry Ingredients:

• In a large bowl, sift together the all-purpose flour, almond flour, baking powder, and salt.

1. Cream Butter and Sugar:

• In a large mixing bowl, cream the butter and sugar together until light and fluffy, about 4-5 minutes with an electric mixer.

1. Add Eggs and Flavors:

• Beat in the eggs one at a time, ensuring each is well incorporated before adding the next.
• Stir in the vanilla extract, almond extract, and orange zest.

1. Combine Wet and Dry Ingredients:

• Alternately add the dry ingredients and orange juice to the creamed mixture, starting and ending with the dry ingredients. Stir until just combined.

1. Add Almonds:

• Fold in the sliced almonds.

1. Bake:

• Pour the batter into the prepared pans, spreading evenly.
• Bake in the preheated oven for 25-30 minutes or until a toothpick inserted into the center comes out clean.

1. Prepare the Glaze:

• Mix the powdered sugar with enough orange juice to achieve a thick but pourable glaze consistency.
• Drizzle over the cooled cakes.

1. Garnish and Serve:

• Sprinkle additional orange zest and sliced almonds over the glaze for decoration.
• Allow the glaze to set before cutting the cake into pieces to serve.

This recipe is designed to be sliced into modest portions given the rich and dense nature of the cake, ensuring that each of the 50 guests receives a satisfying piece. Adjust the size of your slices based on your specific needs or preferences. The orange juice and zest provide a fresh, bright flavor that complements the almonds beautifully, echoing the essence of a classic biscotti.