Preheat oven to 350°F (180°C). Grease a bundt pan or line with parchment paper.
Melt the butter and let it cool slightly.
In a large bowl, cream together the eggs and sugar until light and fluffy.
Add the vanilla extract, melted butter, freshly squeezed orange juice, and grated orange zest. Mix until smooth.
In a separate bowl, whisk together the flour, ground walnuts, baking powder, and salt.
Gradually add the dry ingredients to the wet ingredients, mixing gently until just combined and the batter is smooth.
Pour the batter into the prepared bundt pan and spread evenly.
Bake for 40-45 minutes, or until a toothpick inserted into the center comes out clean.
Let the cake cool in the pan for 10 minutes, then carefully invert it onto a wire rack to cool completely.
Before serving, dust with powdered sugar or drizzle with melted chocolate for extra flavor.
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