SHORTCAKE BISCUITS:
2 cups unbleached all-purpose flour
1/4 cup Sugar
1 tablespoon baking powder
1/2 teaspoon baking soda
1/2 teaspoon salt
1 teaspoon ground ginger
1/2 teaspoon ground cardamom
1/3 cup minced crystallized ginger (optional)
  Grated rind of 1 orange
10 tablespoons unsalted butter (1-1/4 sticks, cut into small pieces)
2/3 cup buttermilk
  FRUIT TOPPING:
2/3 cup Sugar
  Juice of 2 blood orange (about 1/2 cup)
2 cups sliced rhubarb (1/2-inch thick about 1/2 pound)
3 cups ripe strawberries (halved or quartered, depending on size)
2 tablespoons Grand Marnier or orange-flavored liqueur
1 tablespoon finely minced fresh mint
  WHIPPED CREAM:
3/4 cup heavy (whipping) cream (chilled)
2 tablespoons Sugar
1 tablespoon Grand Marnier or orange-flavored liqueur