1Preheat oven to 400 degrees
For the Crust: Grab a medium bowl, add the pretzels, butter and 3 tablespoons of sugar, and mix them together. Press this mixture into a 9 by 13 inch pan. Bake for 7 minutes, Set aside to cool.
2For the Filling: In a mixing bowl, beat together the cream cheese with 3/4 cup of sugar, mix in drained crushed pineapple. Fold in the whipped topping, and spread over the cooled crust. Refrigerate for at least 2 hours, until well chilled.
3For the Topping: In a small bowl, dissolve the gelatin in boiling water, and allow to cool slightly. Add the strawberries and pineapple, and pour over the cream cheese mixture. Refrigerate until serving time.