In a medium bowl, combined thawed strawberries, 1/2 cup of the sugar and orange liqueur. Let stand for 1 hour to allow flavors to blend, stirring occasionally.
Preheat grill to medium-high heat.
In a small bowl, combine the remaining 1/4 sugar and the cinnamon. Remove biscuits from the can and separate. Roll each biscuit in the cinnamon-sugar mixture.
Coat a cast iron skillet with butter or cooking spray. Add strawberry-sugar mixture. Arrange biscuits over strawberries. Place skillet on grill. Cover grill and bake for 15 to 20 minutes or until bubbly. Remove from grill; cool slightly.