In the work bowl of a food processor, combine flour, sugar, salt, and orange zest. Pulse to combine. Add butter, and pulse until mixture is crumbly. With machine running, pour egg through spout, and process until mixture comes together.
Press dough in bottom and up sides of a 9-inch tart pan with removable bottom. Refrigerate at least 30 minutes.
Preheat oven to 375°. Line dough with parchment paper; cover with pie weights. Bake crust until light golden brown, about 20 minutes. Remove from oven, remove parchments and pie weights, and cool completely.
Arrange berries on crust in an overlapping spiral pattern; set aside. In a small bowl, combine liqueur and gelatin. Let stand 5 minutes.
In a small saucepan, heat jelly over medium heat, whisking until melted. Add gelatin mixture, whisking until smooth and gelatin is dissolved. Pour mixture over berries, covering entire surface. Refrigerate at least 2 hours.
Serve with Orange Whipped Cream, if desired. Store covered in refrigerator up to 3 days.
Recipe by Louisiana Cookin' at https://louisianacookin.com/strawberry-tart/