1 cup Sugar
2 large eggs
1/4 cup sour cream
1/3 cup canola oil
2 cups unbleached all-purpose flour
1 1/2 teaspoons baking powder
1/4 teaspoon salt
  grated rind (zest) of 2 oranges
1 tablespoon poppyseeds
1/2 cup orange marmalade
2 tablespoons Cointreau, Grand Marnier, or Triple Sec
  Candied orange slices (as garnish, optional)
  Whipped cream (optional)