01 - 
                Preheat oven to 175°C. In a large mixing bowl, combine graham cracker crumbs, sugar, and melted butter. Reserve 2 tablespoons of mixture for garnish. Press remaining mixture firmly into the base of a 23x33 cm baking dish.
              
              
              
                02 - 
                Bake crust for 8–10 minutes or until lightly golden. Remove from oven and allow to cool completely.
              
              
              
                03 - 
                In a large saucepan, combine chopped rhubarb and water. Cook over medium-high heat for 3–4 minutes, stirring occasionally, until rhubarb is softened. Add sugar, cornstarch, and strawberry gelatin powder. Continue cooking and stirring until the mixture thickens and turns clear.
              
              
              
                04 - 
                Pour the hot rhubarb mixture evenly over the cooled crust. Scatter mini marshmallows evenly over the surface. Refrigerate for approximately 2 hours, or until fully set.
              
              
              
                05 - 
                In a large bowl, whisk together instant vanilla pudding powder and milk until smooth and thick. Gently fold in thawed whipped topping until fully incorporated.
              
              
              
                06 - 
                Spread the pudding mixture evenly over the set marshmallow layer. Sprinkle reserved crumb mixture on top. Refrigerate until completely set before slicing and serving.