Crack the eggs into a bowl and beat them. Gradually add the sugar while mixing.

Use a whisk to combine, then add the orange juice and vegetable oil, mixing until well blended. Now use a mixer to beat until fluffy, then sift in the flour and mix until smooth.

Pour in the melted chocolate and mix well. Preheat the oven to 350ºF. Grease two cake pans, divide the batter evenly between them, and tap the pans gently to level the batter. Place in the oven.

Bake for about 25 minutes, or until a toothpick comes out clean. Let the cakes cool before removing them from the pans.