2 eggs
2/3 cup white sugar
4 tablespoons unsalted butter, melted
1/4 cup extra virgin olive oil
1/3 cup milk
1/2 teaspoon vanilla extract
1 1/2 cups all-purpose flour
3/4 teaspoon baking powder
1 pinch salt
2 tablespoons grated lemon zest
2 tablespoons grated orange zest
10 ounces small purple grapes